diff --git a/api/source/mk_frame.cpp b/api/source/mk_frame.cpp
index 367e8cc3..ff45da07 100644
--- a/api/source/mk_frame.cpp
+++ b/api/source/mk_frame.cpp
@@ -161,16 +161,16 @@ API_EXPORT uint32_t API_CALL mk_frame_get_flags(mk_frame frame) {
     auto &ref = *((Frame::Ptr *) frame);
     uint32_t ret = 0;
     if (ref->keyFrame()) {
-        ret &= MK_FRAME_FLAG_IS_KEY;
+        ret |= MK_FRAME_FLAG_IS_KEY;
     }
     if (ref->configFrame()) {
-        ret &= MK_FRAME_FLAG_IS_CONFIG;
+        ret |= MK_FRAME_FLAG_IS_CONFIG;
     }
     if (ref->dropAble()) {
-        ret &= MK_FRAME_FLAG_DROP_ABLE;
+        ret |= MK_FRAME_FLAG_DROP_ABLE;
     }
     if (!ref->decodeAble()) {
-        ret &= MK_FRAME_FLAG_NOT_DECODE_ABLE;
+        ret |= MK_FRAME_FLAG_NOT_DECODE_ABLE;
     }
     return ret;
-}
\ No newline at end of file
+}