diff --git a/include/bh/internal/thread_null.h b/include/bh/internal/thread_null.h
index 322ef26..035d585 100644
--- a/include/bh/internal/thread_null.h
+++ b/include/bh/internal/thread_null.h
@@ -11,7 +11,7 @@ struct bh_mutex_s
 struct bh_semaphore_s
 {
     void *handle;
-}:
+};
 
 struct bh_cond_s
 {