diff --git a/src/template.c b/src/template.c
index e6c528d..cad211f 100644
--- a/src/template.c
+++ b/src/template.c
@@ -147,6 +147,7 @@ main(void)
 	// 1. open file
 	FILE* output_file = fopen(OUTPUT_FILE, "wb");
 	if (output_file == NULL) {
+		fflush(stdout);
 		perror("fopen");
 		return 1;
 	}