diff --git a/modules/archive.module b/modules/archive.module
index a8a5e0cb8cef6b47bf2f80af2c60522c76ded1c7..3458b37619316d36164b4fd79c7fe6ff1b0a3cdf 100644
--- a/modules/archive.module
+++ b/modules/archive.module
@@ -58,7 +58,7 @@ function archive_calendar($original = 0) {
 
   $end_of_month = mktime(23, 59, 59, $month, $last, $year);
 
-  $cache = cache_get("archive:calendar:$start_of_month");
+  $cache = cache_get("archive:calendar:$day-$month-$year");
 
   if (!empty($cache)) {
     return $cache->data;
@@ -159,7 +159,7 @@ function archive_calendar($original = 0) {
 
   $output .= "</table></div>\n\n";
 
-  cache_set("archive:calendar:$start_of_month", $output, 1);
+  cache_set("archive:calendar:$day-$month-$year", $output, 1);
 
   return $output;
 }