diff --git a/gitweb/Makefile b/gitweb/Makefile
index 0baa9df..403265a 100644
--- a/gitweb/Makefile
+++ b/gitweb/Makefile
@@ -117,6 +117,7 @@
 # js/lib/common-lib.js should be always first, then js/lib/*.js,
 # then the rest of files; js/gitweb.js should be last (if it exists)
 GITWEB_JSLIB_FILES += static/js/lib/common-lib.js
+GITWEB_JSLIB_FILES += static/js/lib/datetime.js
 GITWEB_JSLIB_FILES += static/js/javascript-detection.js
 GITWEB_JSLIB_FILES += static/js/blame_incremental.js