diff --git a/libavcodec/hevc_mvs.c b/libavcodec/hevc_mvs.c
index e2b592c8724b875f62a934f388edeb84e86189b3..26c7c10b57c6f789001cc0609a89a3fb9acfa3d5 100644
--- a/libavcodec/hevc_mvs.c
+++ b/libavcodec/hevc_mvs.c
@@ -227,8 +227,10 @@ static int temporal_luma_motion_vector(HEVCContext *s, int x0, int y0,
 
     HEVCFrame *ref = s->ref->collocated_ref;
 
-    if (!ref)
+    if (!ref) {
+        memset(mvLXCol, 0, sizeof(*mvLXCol));
         return 0;
+    }
 
     tab_mvf = ref->tab_mvf;
     colPic  = ref->poc;