diff --git a/glslang/MachineIndependent/ParseHelper.cpp b/glslang/MachineIndependent/ParseHelper.cpp
index 69f47998..8016e2ea 100644
--- a/glslang/MachineIndependent/ParseHelper.cpp
+++ b/glslang/MachineIndependent/ParseHelper.cpp
@@ -1585,6 +1585,9 @@ void TParseContext::builtInOpCheck(const TSourceLoc& loc, const TFunction& fnCan
     case EOpInterpolateAtCentroid:
     case EOpInterpolateAtSample:
     case EOpInterpolateAtOffset:
+#ifdef AMD_EXTENSIONS
+    case EOpInterpolateAtVertex:
+#endif
         // Make sure the first argument is an interpolant, or an array element of an interpolant
         if (arg0->getType().getQualifier().storage != EvqVaryingIn) {
             // It might still be an array element.