diff --git a/program/lib/Roundcube/rcube_utils.php b/program/lib/Roundcube/rcube_utils.php
index a407baf6e..a98181302 100644
--- a/program/lib/Roundcube/rcube_utils.php
+++ b/program/lib/Roundcube/rcube_utils.php
@@ -555,7 +555,7 @@ class rcube_utils
                                 $value .= ' url(' . $url . ')';
                             }
                         }
-                    } elseif (preg_match('/;.*/', $val)) {
+                    } elseif (preg_match('/;.+/', $val)) {
                         // Invalid or evil content, ignore
                         continue;
                     } else {