diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index f1b4b292920..05218a3d6d2 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -20390,8 +20390,11 @@ static SDValue LowerVSETCC(SDValue Op, const X86Subtarget &Subtarget,
 
   // This is being called by type legalization because v2i32 is marked custom
   // for result type legalization for v2f32.
-  if (VTOp0 == MVT::v2i32)
+  if (VTOp0 == MVT::v2i32) {
+    assert(!ExperimentalVectorWideningLegalization &&
+           "Should only get here with promote legalization!");
     return SDValue();
+  }
 
   // The non-AVX512 code below works under the assumption that source and
   // destination types are the same.