diff --git a/include/coroutine.h b/include/coroutine.h
index a3618c8150b555eb0f6fe0a26d90ab78895c7522..2b736dfbb3e047962f4282fc808b734a77d8767c 100644
--- a/include/coroutine.h
+++ b/include/coroutine.h
@@ -35,7 +35,7 @@ protected:
         coroutines[cid] = this;
     }
 
-    inline long run()
+    long run()
     {
         long cid = this->cid;
         origin = current;