diff --git a/hls/ngx_rtmp_hls_module.c b/hls/ngx_rtmp_hls_module.c
index cc95ae0..5d7dc4a 100644
--- a/hls/ngx_rtmp_hls_module.c
+++ b/hls/ngx_rtmp_hls_module.c
@@ -633,7 +633,7 @@ ngx_rtmp_hls_write_playlist(ngx_rtmp_session_t *s)
 
     prev_key_id = 0;
 
-    for (i = start_i; i < ctx->nfrags; i++) {
+    for (i = start_i; i < (ngx_int_t)ctx->nfrags; i++) {
         f = ngx_rtmp_hls_get_frag(s, i);
         if (i == 0 && f->datetime && f->datetime->len > 0) {
             p = ngx_snprintf(buffer, sizeof(buffer), "#EXT-X-PROGRAM-DATE-TIME:");