diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
index 0b08309e4e6e0..27e0986192165 100644
--- a/clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -335,7 +335,7 @@ bool ByteCodeExprGen<Emitter>::VisitCastExpr(const CastExpr *CE) {
     return discard(SubExpr);
 
   default:
-    assert(false && "Cast not implemented");
+    return this->emitInvalid(CE);
   }
   llvm_unreachable("Unhandled clang::CastKind enum");
 }