diff --git a/libvideoeditor/vss/mcs/src/M4MCS_API.c b/libvideoeditor/vss/mcs/src/M4MCS_API.c
index d75a495..3844630 100755
--- a/libvideoeditor/vss/mcs/src/M4MCS_API.c
+++ b/libvideoeditor/vss/mcs/src/M4MCS_API.c
@@ -8866,7 +8866,7 @@
     }
 
 
-    if ((pC->EncodingVideoFormat = M4ENCODER_kNULL)
+    if ((pC->EncodingVideoFormat == M4ENCODER_kNULL)
         && (pC->bLastDecodedFrameCTS == M4OSA_FALSE)
         && (pC->uiBeginCutTime > 0)) {