diff --git a/min/lib/CSSmin.php b/min/lib/CSSmin.php
index fab0102..b820beb 100644
--- a/min/lib/CSSmin.php
+++ b/min/lib/CSSmin.php
@@ -766,12 +766,12 @@ class CSSmin
     {
         if (is_string($size)) {
             switch (substr($size, -1)) {
-                case 'M': case 'm': return $size * 1048576;
-                case 'K': case 'k': return $size * 1024;
-                case 'G': case 'g': return $size * 1073741824;
+                case 'M': case 'm': return (int) $size * 1048576;
+                case 'K': case 'k': return (int) $size * 1024;
+                case 'G': case 'g': return (int) $size * 1073741824;
             }
         }
 
         return (int) $size;
     }
-}
\ No newline at end of file
+}