diff --git a/src/pkg/runtime/rune.c b/src/pkg/runtime/rune.c
index 652ccdfa666..598edc6f369 100644
--- a/src/pkg/runtime/rune.c
+++ b/src/pkg/runtime/rune.c
@@ -161,8 +161,9 @@ bad:
 	*rune = Bad;
 	return 1;
 badlen:
+	// was return 0, but return 1 is more convenient for the runtime.
 	*rune = Bad;
-	return 0;
+	return 1;
 
 }
 
diff --git a/test/bugs/bug204.go b/test/fixedbugs/bug204.go
similarity index 100%
rename from test/bugs/bug204.go
rename to test/fixedbugs/bug204.go