diff --git a/include/swift/Basic/Features.def b/include/swift/Basic/Features.def
index 2c60d2e1acf16..0b44270e1ed18 100644
--- a/include/swift/Basic/Features.def
+++ b/include/swift/Basic/Features.def
@@ -267,6 +267,7 @@ SUPPRESSIBLE_LANGUAGE_FEATURE(ABIAttributeSE0479, 479, "@abi attribute on functi
 LANGUAGE_FEATURE(AlwaysInheritActorContext, 472, "@_inheritActorContext(always)")
 LANGUAGE_FEATURE(BuiltinSelect, 0, "Builtin.select")
 LANGUAGE_FEATURE(BuiltinInterleave, 0, "Builtin.interleave and Builtin.deinterleave")
+LANGUAGE_FEATURE(BuiltinVectorsExternC, 0, "Extern C support for Builtin vector types")
 
 // Swift 6
 UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
diff --git a/lib/AST/FeatureSet.cpp b/lib/AST/FeatureSet.cpp
index 3c0ae6fefe3d4..68c5af466077a 100644
--- a/lib/AST/FeatureSet.cpp
+++ b/lib/AST/FeatureSet.cpp
@@ -679,6 +679,7 @@ static bool usesFeatureDefaultIsolationPerFile(Decl *D) {
 
 UNINTERESTING_FEATURE(BuiltinSelect)
 UNINTERESTING_FEATURE(BuiltinInterleave)
+UNINTERESTING_FEATURE(BuiltinVectorsExternC)
 
 // ----------------------------------------------------------------------------
 // MARK: - FeatureSet