diff --git a/libavutil/opt.c b/libavutil/opt.c
index f59bad352f..9af3fe47cb 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -927,7 +927,7 @@ int main(void)
 
     printf("\nTesting av_set_options_string()\n");
     {
-        TestContext test_ctx;
+        TestContext test_ctx = { 0 };
         const char *options[] = {
             "",
             ":",