1 files changed, 6 insertions, 2 deletions
diff --git a/src/tools/spec-wrapper.h b/src/tools/spec-wrapper.h
index beada1b4b..f59291e55 100644
--- a/src/tools/spec-wrapper.h
+++ b/src/tools/spec-wrapper.h
@@ -48,8 +48,12 @@ static std::string generateSpecWrapper(Module& wasm) {
         case v128:
           ret += "(v128.const i32x4 0 0 0 0)";
           break;
-        case anyref: // there's no anyref.const
-        case exnref: // there's no exnref.const
+        case funcref:
+        case anyref:
+        case nullref:
+        case exnref:
+          ret += "(ref.null)";
+          break;
         case none:
         case unreachable:
           WASM_UNREACHABLE("unexpected type");