diff --git a/src/js/assets.js b/src/js/assets.js
index d8f22c795..8c94ad732 100644
--- a/src/js/assets.js
+++ b/src/js/assets.js
@@ -51,11 +51,13 @@ let remoteServerFriendly = false;
 const stringIsNotEmpty = s => typeof s === 'string' && s !== '';
 
 const parseExpires = s => {
-    const matches = s.match(/(\d+)\s*([dh])?/i);
+    const matches = s.match(/(\d+)\s*([dhm]?)/i);
     if ( matches === null ) { return 0; }
     let updateAfter = parseInt(matches[1], 10);
     if ( matches[2] === 'h' ) {
         updateAfter = Math.max(updateAfter, 4) / 24;
+    } else if ( matches[2] === 'm' ) {
+        updateAfter = Math.max(updateAfter, 240) / 1440;
     }
     return updateAfter;
 };