diff --git a/libavutil/hwcontext_d3d11va.c b/libavutil/hwcontext_d3d11va.c
index 65dd6651fc..a38b72fb00 100644
--- a/libavutil/hwcontext_d3d11va.c
+++ b/libavutil/hwcontext_d3d11va.c
@@ -472,6 +472,7 @@ static void d3d11va_device_uninit(AVHWDeviceContext *hwdev)

     if (device_hwctx->lock == d3d11va_default_lock)
         CloseHandle(device_hwctx->lock_ctx);
+    device_hwctx->lock   = NULL;
 }

 static int d3d11va_device_create(AVHWDeviceContext *ctx, const char *device,