diff --git a/at_core/inc/get.inc b/at_core/inc/get.inc
index f9a5915..950f454 100755
--- a/at_core/inc/get.inc
+++ b/at_core/inc/get.inc
@@ -225,7 +225,7 @@ function at_get_browser() {
     else if (function_exists('browscap_get_browser')) {
       $browscap = browscap_get_browser();
       if ($browscap) {
-        if ($browscap['ismobiledevice'] == TRUE) {
+        if (filter_var($browscap['ismobiledevice'], FILTER_VALIDATE_BOOLEAN) == TRUE) {
           $browser['is_mobile'] = TRUE;
         }
       }