diff --git a/modules/highgui/src/cap_ffmpeg_impl.hpp b/modules/highgui/src/cap_ffmpeg_impl.hpp
index be9c7aa3e2..5f0207c165 100644
--- a/modules/highgui/src/cap_ffmpeg_impl.hpp
+++ b/modules/highgui/src/cap_ffmpeg_impl.hpp
@@ -485,6 +485,7 @@ static int LockCallBack(void **mutex, AVLockOp op)
             localMutex->destroy();
             free(localMutex);
             localMutex = NULL;
+            *mutex = NULL;
         break;
     }
     return 0;