diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index 4136da795..2275dbf20 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -1842,7 +1842,7 @@ ngx_http_mp4_update_stts_atom(ngx_http_mp4_file_t *mp4,
     }
 
     ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
-                  "start time is out mp4 stts samples in \"%\"",
+                  "start time is out mp4 stts samples in \"%s\"",
                   mp4->file.name.data);
 
     return NGX_ERROR;
@@ -2488,7 +2488,7 @@ ngx_http_mp4_update_stco_atom(ngx_http_mp4_file_t *mp4,
 
     if (trak->start_chunk > trak->chunks) {
         ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
-                      "start time is out mp4 stco chunks in \"%\"",
+                      "start time is out mp4 stco chunks in \"%s\"",
                       mp4->file.name.data);
         return NGX_ERROR;
     }