diff --git a/crate2nix/Cargo.nix b/crate2nix/Cargo.nix
index 403294c9..08469f65 100644
--- a/crate2nix/Cargo.nix
+++ b/crate2nix/Cargo.nix
@@ -3581,6 +3581,7 @@ rec {
     }:
       assert (builtins.isList features);
       assert (builtins.isList dependencies);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       let
         enabledDependencies = filterEnabledDependencies {
@@ -3711,6 +3712,7 @@ rec {
       assert (builtins.isList features);
       assert (builtins.isList dependencyPath);
       assert (builtins.isAttrs featuresByPackageId);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       assert (builtins.isBool runTests);
       let
diff --git a/crate2nix/templates/nix/crate2nix/default.nix b/crate2nix/templates/nix/crate2nix/default.nix
index c6fdd748..097cc7f8 100644
--- a/crate2nix/templates/nix/crate2nix/default.nix
+++ b/crate2nix/templates/nix/crate2nix/default.nix
@@ -452,6 +452,7 @@ rec {
     }:
       assert (builtins.isList features);
       assert (builtins.isList dependencies);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       let
         enabledDependencies = filterEnabledDependencies {
@@ -582,6 +583,7 @@ rec {
       assert (builtins.isList features);
       assert (builtins.isList dependencyPath);
       assert (builtins.isAttrs featuresByPackageId);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       assert (builtins.isBool runTests);
       let
diff --git a/sample_projects/bin_with_git_submodule_dep/Cargo.nix b/sample_projects/bin_with_git_submodule_dep/Cargo.nix
index 5c0b9b98..4772e35d 100644
--- a/sample_projects/bin_with_git_submodule_dep/Cargo.nix
+++ b/sample_projects/bin_with_git_submodule_dep/Cargo.nix
@@ -1799,6 +1799,7 @@ rec {
     }:
       assert (builtins.isList features);
       assert (builtins.isList dependencies);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       let
         enabledDependencies = filterEnabledDependencies {
@@ -1929,6 +1930,7 @@ rec {
       assert (builtins.isList features);
       assert (builtins.isList dependencyPath);
       assert (builtins.isAttrs featuresByPackageId);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       assert (builtins.isBool runTests);
       let
diff --git a/sample_projects/codegen/Cargo.nix b/sample_projects/codegen/Cargo.nix
index f84b08bb..5b35dc02 100644
--- a/sample_projects/codegen/Cargo.nix
+++ b/sample_projects/codegen/Cargo.nix
@@ -974,6 +974,7 @@ rec {
     }:
       assert (builtins.isList features);
       assert (builtins.isList dependencies);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       let
         enabledDependencies = filterEnabledDependencies {
@@ -1104,6 +1105,7 @@ rec {
       assert (builtins.isList features);
       assert (builtins.isList dependencyPath);
       assert (builtins.isAttrs featuresByPackageId);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       assert (builtins.isBool runTests);
       let
diff --git a/sample_projects/sub_dir_crates/Cargo.nix b/sample_projects/sub_dir_crates/Cargo.nix
index 53ec4e29..e33621b8 100644
--- a/sample_projects/sub_dir_crates/Cargo.nix
+++ b/sample_projects/sub_dir_crates/Cargo.nix
@@ -583,6 +583,7 @@ rec {
     }:
       assert (builtins.isList features);
       assert (builtins.isList dependencies);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       let
         enabledDependencies = filterEnabledDependencies {
@@ -713,6 +714,7 @@ rec {
       assert (builtins.isList features);
       assert (builtins.isList dependencyPath);
       assert (builtins.isAttrs featuresByPackageId);
+      assert (builtins.isString target);
       assert (builtins.isAttrs targetSpec);
       assert (builtins.isBool runTests);
       let