diff --git a/tests-clay/config/stress.c b/tests-clay/config/stress.c
index 7b81400c1..832321556 100644
--- a/tests-clay/config/stress.c
+++ b/tests-clay/config/stress.c
@@ -8,7 +8,7 @@
 
 void test_config_stress__initialize(void)
 {
-	git_filebuf file;
+	git_filebuf file = GIT_FILEBUF_INIT;
 
 	git_filebuf_open(&file, TEST_CONFIG, 0);