diff --git a/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java b/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
index c4e769b..720392e 100644
--- a/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
+++ b/test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java
@@ -61,7 +61,7 @@ public class RuntimeErrors {
         if( newlineIdx > 0 ) {
             error = error.substring( 0, newlineIdx );
         }
-        String expected = script == ScriptEngine.SpiderMonkey ? "TypeError: cannot pass i64 to or from JS" : "TypeError: wasm function signature contains illegal type";
+        String expected = script == ScriptEngine.SpiderMonkey || script == ScriptEngine.SpiderMonkeyWat ? "TypeError: cannot pass i64 to or from JS" : "TypeError: wasm function signature contains illegal type";
         assertEquals( expected, error );
     }