diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index 9caf71411a..47b3bedbe6 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -666,7 +666,7 @@ OpenLayers.Date = {
                     // check offset
                     if (type !== "Z") {
                         var hoursOffset = parseInt(type, 10);
-                        var minutesOffset = parseInt(match[8]) || 0;
+                        var minutesOffset = parseInt(match[8], 10) || 0;
                         var offset = -1000 * (60 * (hoursOffset * 60) + minutesOffset * 60);
                         date = new Date(date.getTime() + offset);
                     }