diff --git a/test/copy_flash.c b/test/copy_flash.c
index 5c40b53..d39ef93 100644
--- a/test/copy_flash.c
+++ b/test/copy_flash.c
@@ -66,7 +66,7 @@
 		goto free;
 	}
 
-	rc = tmpf_init(&tmp, "flashXXXXXX");
+	rc = tmpf_init(&tmp, "flash-store.XXXXXX");
 	if (rc < 0)
 		goto free;