diff --git a/dash/ngx_rtmp_dash_module.c b/dash/ngx_rtmp_dash_module.c
index 3d96f06..012f53e 100644
--- a/dash/ngx_rtmp_dash_module.c
+++ b/dash/ngx_rtmp_dash_module.c
@@ -231,7 +231,7 @@ ngx_rtmp_dash_write_playlist(ngx_rtmp_session_t *s)
     static u_char              buffer[NGX_RTMP_DASH_BUFSIZE];
     static u_char              start_time[sizeof("1970-09-28T12:00:00+06:00")];
     static u_char              end_time[sizeof("1970-09-28T12:00:00+06:00")];
-    static u_char              buffer_depth[sizeof("PT1234H00M00.00S")];
+    static u_char              buffer_depth[sizeof("PT000D00H00M00.00S")];
     static u_char              frame_rate[(NGX_INT_T_LEN * 2) + 2];
 
     dacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_dash_module);
@@ -374,14 +374,14 @@ ngx_rtmp_dash_write_playlist(ngx_rtmp_session_t *s)
                  ngx_rtmp_dash_get_frag(s, 0)->timestamp);
 
     depth_hour = (ngx_uint_t) (depth_msec / 3600 / 1000);
-    depth_msec -= depth_hour * 3600000;
+    depth_msec -= depth_hour * (3600 * 1000);
     depth_min = (ngx_uint_t) (depth_msec / 60 / 1000);
-    depth_msec -= depth_min * 60000;
+    depth_msec -= depth_min * (60 * 1000);
 
     *ngx_sprintf(buffer_depth, "PT%dH%02dM%02d.%02dS",
                  depth_hour, depth_min,
                  (ngx_uint_t) (depth_msec / 1000),
-                 depth_msec % 1000);
+                 (ngx_uint_t) ((depth_msec % 1000) / 10));
 
     last = buffer + sizeof(buffer);