diff --git a/pkg/dart2wasm/lib/types.dart b/pkg/dart2wasm/lib/types.dart
index 44daee549b0..9a9f3df4349 100644
--- a/pkg/dart2wasm/lib/types.dart
+++ b/pkg/dart2wasm/lib/types.dart
@@ -611,23 +611,16 @@ class Types {
     }
 
     if (type.typeArguments.any((t) => t is! DynamicType)) {
-      // Type has at least one type argument that is not `dynamic`.
-      //
-      // In cases like `x is List<T>` where `x : Iterable<T>` (tested-against
-      // type is a subtype of the operand's static type and the types have same
-      // number of type arguments), it is not necessary to test the type
-      // arguments.
+      // If the tested-against type as an instance of the static operand type
+      // has the same type arguments as the static operand type, it is not
+      // necessary to test the type arguments.
       Class cls = translator.classForType(operandType);
       InterfaceType? base = translator.hierarchy
           .getTypeAsInstanceOf(type, cls,
               isNonNullableByDefault:
                   codeGen.member.enclosingLibrary.isNonNullableByDefault)
           ?.withDeclaredNullability(operandType.declaredNullability);
-
-      final sameNumTypeParams = operandType is InterfaceType &&
-          operandType.typeArguments.length == type.typeArguments.length;
-
-      if (!(sameNumTypeParams && base == operandType)) {
+      if (base != operandType) {
         makeType(codeGen, type);
         codeGen.call(translator.isSubtype.reference);
         _endPotentiallyNullableBlock();
diff --git a/tests/web/wasm/static_interop_test.dart b/tests/web/wasm/static_interop_test.dart
index 3c66bd9d27e..25b7e7c54d8 100644
--- a/tests/web/wasm/static_interop_test.dart
+++ b/tests/web/wasm/static_interop_test.dart
@@ -311,7 +311,7 @@ extension AnonymousJSClassExtension on AnonymousJSClass {
   external String? get bleep;
   external int? get goo;
   external int? get ooo;
-  external List<Object?>? saz;
+  external List<double>? saz;
   external List<double>? zoo;
 }