diff --git a/packages/react-native-cli/src/lib/Xcode.ts b/packages/react-native-cli/src/lib/Xcode.ts
index c9dec0e463..359d9e98bb 100644
--- a/packages/react-native-cli/src/lib/Xcode.ts
+++ b/packages/react-native-cli/src/lib/Xcode.ts
@@ -7,11 +7,11 @@ const DOCS_LINK = 'https://docs.bugsnag.com/platforms/react-native/react-native/
 const UNLOCATED_PROJ_MSG = `The Xcode project was not in the expected location and so couldn't be updated automatically.
 
 Update the "Bundle React Native Code And Images" build phase with the following environment variables:
-export EXTRA_PACKAGER_ARGS="--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map"
+export EXTRA_PACKAGER_ARGS="--sourcemap-output $TMPDIR/$(md5 -qs "$CONFIGURATION_BUILD_DIR")-main.jsbundle.map""
 
 See ${DOCS_LINK} for more information`
 
-const EXTRA_PACKAGER_ARGS = 'export EXTRA_PACKAGER_ARGS="--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map"'
+const EXTRA_PACKAGER_ARGS = 'export EXTRA_PACKAGER_ARGS="--sourcemap-output $TMPDIR/$(md5 -qs "$CONFIGURATION_BUILD_DIR")-main.jsbundle.map"'
 
 export async function updateXcodeProject (projectRoot: string, endpoint: string|undefined, logger: Logger) {
   const iosDir = path.join(projectRoot, 'ios')
@@ -76,7 +76,7 @@ async function addUploadSourceMapsTask (
     }
   }
 
-  let shellScript = '../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh'
+  let shellScript = 'SOURCE_MAP="$TMPDIR/$(md5 -qs "$CONFIGURATION_BUILD_DIR")-main.jsbundle.map" ../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh'
 
   if (endpoint) {
     shellScript = `export ENDPOINT='${endpoint}'\\n${shellScript}`
diff --git a/packages/react-native-cli/src/lib/__test__/fixtures/project-after-with-endpoint.pbxproj b/packages/react-native-cli/src/lib/__test__/fixtures/project-after-with-endpoint.pbxproj
index 564b7cdb16..93265ba4a0 100644
--- a/packages/react-native-cli/src/lib/__test__/fixtures/project-after-with-endpoint.pbxproj
+++ b/packages/react-native-cli/src/lib/__test__/fixtures/project-after-with-endpoint.pbxproj
@@ -376,7 +376,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
+			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
 		};
 		2D02E4CB1E0B4B27006451C7 /* Bundle React Native Code And Images */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -390,7 +390,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
+			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
 		};
 		3EBDF05F265B984FA826288C /* [CP] Check Pods Manifest.lock */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -566,7 +566,7 @@
 			outputPaths = (
 			);
 			shellPath = /bin/sh;
-			shellScript = "export ENDPOINT='https://upload.example.com'\n../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh";
+			shellScript = "export ENDPOINT='https://upload.example.com'\nSOURCE_MAP=\"$TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\" ../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh";
 		};
 /* End PBXShellScriptBuildPhase section */
 
diff --git a/packages/react-native-cli/src/lib/__test__/fixtures/project-after.pbxproj b/packages/react-native-cli/src/lib/__test__/fixtures/project-after.pbxproj
index a0944830c6..8b440d1aa7 100644
--- a/packages/react-native-cli/src/lib/__test__/fixtures/project-after.pbxproj
+++ b/packages/react-native-cli/src/lib/__test__/fixtures/project-after.pbxproj
@@ -376,7 +376,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
+			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
 		};
 		2D02E4CB1E0B4B27006451C7 /* Bundle React Native Code And Images */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -390,7 +390,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
+			shellScript = "export EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
 		};
 		3EBDF05F265B984FA826288C /* [CP] Check Pods Manifest.lock */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -566,7 +566,7 @@
 			outputPaths = (
 			);
 			shellPath = /bin/sh;
-			shellScript = "../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh";
+			shellScript = "SOURCE_MAP=\"$TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\" ../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh";
 		};
 /* End PBXShellScriptBuildPhase section */
 
diff --git a/packages/react-native/bugsnag-react-native-xcode.sh b/packages/react-native/bugsnag-react-native-xcode.sh
index e70f522ebb..1bf50d08ab 100755
--- a/packages/react-native/bugsnag-react-native-xcode.sh
+++ b/packages/react-native/bugsnag-react-native-xcode.sh
@@ -23,9 +23,12 @@ if [ ! -f "$BUNDLE_FILE" ]; then
   exit 0
 fi
 
-MAP_FILE="$BUNDLE_FILE.map"
-if [ ! -f "$MAP_FILE" ]; then
-  echo "Error: Source map main.jsbundle.map could not be found."
+if [ -z "$SOURCE_MAP" ]; then
+  echo "Warning: SOURCE_MAP was not specified, falling back to $BUNDLE_FILE.map"
+  SOURCE_MAP="$BUNDLE_FILE.map"
+fi
+if [ ! -f "$SOURCE_MAP" ]; then
+  echo "Error: SOURCE_MAP $SOURCE_MAP could not be found."
   echo "Ensure the --sourcemap-output option is passed to the react-native bundle command."
   exit 1
 fi
@@ -39,7 +42,7 @@ ARGS=(
     "--app-version" "$APP_VERSION"
     "--bundle" "$BUNDLE_FILE"
     "--platform" "ios"
-    "--source-map" "$MAP_FILE"
+    "--source-map" "$SOURCE_MAP"
     "--project-root" "$PROJECT_ROOT"
     )
 
diff --git a/test/react-native-cli/features/fixtures/rn0_60/check-ios-build-script.sh b/test/react-native-cli/features/fixtures/rn0_60/check-ios-build-script.sh
index 94b2280f41..ee54e673df 100755
--- a/test/react-native-cli/features/fixtures/rn0_60/check-ios-build-script.sh
+++ b/test/react-native-cli/features/fixtures/rn0_60/check-ios-build-script.sh
@@ -6,7 +6,7 @@
 
 set -ex
 
-fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"' ios/rn0_60.xcodeproj/project.pbxproj
+fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"' ios/rn0_60.xcodeproj/project.pbxproj
 
 if [ ! -z "$1" ]; then
     fgrep "export ENDPOINT='$1'" ios/rn0_60.xcodeproj/project.pbxproj
diff --git a/test/react-native-cli/features/fixtures/rn0_61/check-ios-build-script.sh b/test/react-native-cli/features/fixtures/rn0_61/check-ios-build-script.sh
index 11e1cc71c3..ec75dcc6de 100755
--- a/test/react-native-cli/features/fixtures/rn0_61/check-ios-build-script.sh
+++ b/test/react-native-cli/features/fixtures/rn0_61/check-ios-build-script.sh
@@ -6,7 +6,7 @@
 
 set -ex
 
-fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"' ios/rn0_61.xcodeproj/project.pbxproj
+fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"' ios/rn0_61.xcodeproj/project.pbxproj
 
 if [ ! -z "$1" ]; then
     fgrep "export ENDPOINT='$1'" ios/rn0_61.xcodeproj/project.pbxproj
diff --git a/test/react-native-cli/features/fixtures/rn0_62/check-ios-build-script.sh b/test/react-native-cli/features/fixtures/rn0_62/check-ios-build-script.sh
index 5973a2aa4e..d65384981a 100755
--- a/test/react-native-cli/features/fixtures/rn0_62/check-ios-build-script.sh
+++ b/test/react-native-cli/features/fixtures/rn0_62/check-ios-build-script.sh
@@ -6,7 +6,7 @@
 
 set -ex
 
-fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"' ios/rn0_62.xcodeproj/project.pbxproj
+fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"' ios/rn0_62.xcodeproj/project.pbxproj
 
 if [ ! -z "$1" ]; then
     fgrep "export ENDPOINT='$1'" ios/rn0_62.xcodeproj/project.pbxproj
diff --git a/test/react-native-cli/features/fixtures/rn0_63/check-ios-build-script.sh b/test/react-native-cli/features/fixtures/rn0_63/check-ios-build-script.sh
index 5b6d9aa069..d5ea6682f8 100755
--- a/test/react-native-cli/features/fixtures/rn0_63/check-ios-build-script.sh
+++ b/test/react-native-cli/features/fixtures/rn0_63/check-ios-build-script.sh
@@ -6,7 +6,7 @@
 
 set -ex
 
-fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"' ios/rn0_63.xcodeproj/project.pbxproj
+fgrep 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"' ios/rn0_63.xcodeproj/project.pbxproj
 
 if [ ! -z "$1" ]; then
     fgrep "export ENDPOINT='$1'" ios/rn0_63.xcodeproj/project.pbxproj
diff --git a/test/react-native-cli/features/steps/steps.rb b/test/react-native-cli/features/steps/steps.rb
index 64fc6a438e..4233920a73 100644
--- a/test/react-native-cli/features/steps/steps.rb
+++ b/test/react-native-cli/features/steps/steps.rb
@@ -114,7 +114,7 @@ def parse_package_json
 Then("the iOS build has not been modified to upload source maps") do
   filename = "ios/#{current_fixture}.xcodeproj/project.pbxproj"
 
-  step("the interactive file '#{filename}' does not contain 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $CONFIGURATION_BUILD_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/main.jsbundle.map\"'")
+  step("the interactive file '#{filename}' does not contain 'EXTRA_PACKAGER_ARGS=\"--sourcemap-output $TMPDIR/$(md5 -qs \"$CONFIGURATION_BUILD_DIR\")-main.jsbundle.map\"'")
   step("the interactive file '#{filename}' does not contain 'Upload source maps to Bugsnag'")
 end