diff --git a/api/packages/opentelemetry-api/tsconfig.json b/api/packages/opentelemetry-api/tsconfig.json
index df95d9cc57..79cc5cefac 100644
--- a/api/packages/opentelemetry-api/tsconfig.json
+++ b/api/packages/opentelemetry-api/tsconfig.json
@@ -1,5 +1,5 @@
 {
-  "extends": "../tsconfig.base",
+  "extends": "../tsconfig.es5",
   "compilerOptions": {
     "rootDir": ".",
     "outDir": "build"
diff --git a/api/packages/opentelemetry-context-base/tsconfig.json b/api/packages/opentelemetry-context-base/tsconfig.json
index a2042cd68b..ca8d7656bb 100644
--- a/api/packages/opentelemetry-context-base/tsconfig.json
+++ b/api/packages/opentelemetry-context-base/tsconfig.json
@@ -1,5 +1,5 @@
 {
-  "extends": "../tsconfig.base",
+  "extends": "../tsconfig.es5",
   "compilerOptions": {
     "rootDir": ".",
     "outDir": "build"