diff --git a/ubi-utils/src/ubimirror.c b/ubi-utils/src/ubimirror.c
index 2cc4596..a20e1af 100644
--- a/ubi-utils/src/ubimirror.c
+++ b/ubi-utils/src/ubimirror.c
@@ -203,7 +203,7 @@ main(int argc, char **argv) {
 		       err_buf, sizeof(err_buf));
 	if( rc ){
 		err_buf[sizeof err_buf - 1] = '\0';
-		fprintf(stderr, err_buf);
+		fprintf(stderr, "%s", err_buf);
 		if( rc < 0 )
 			rc = -rc;
 	}