diff --git a/simplesamlphp_auth.info b/simplesamlphp_auth.info
index d5f1f82..f5f63ef 100644
--- a/simplesamlphp_auth.info
+++ b/simplesamlphp_auth.info
@@ -2,3 +2,4 @@ name = SimpleSAMLphp authentication
 description = Allows users to authenticate to a remote SAML identity provider (IdP) via a locally configured SimpleSAMLphp service point (SP).
 core = 7.x
 configure = admin/config/people/simplesamlphp_auth
+php = 5.3
diff --git a/simplesamlphp_auth.module b/simplesamlphp_auth.module
index a91bb6a..e492d92 100644
--- a/simplesamlphp_auth.module
+++ b/simplesamlphp_auth.module
@@ -592,7 +592,7 @@ function _simplesamlphp_auth_rolepopulation($rolemap) {
 
         watchdog('simplesamlphp_auth', 'Evaluate role evaulation: %roleruleeval', array('%roleruleeval' => $roleruleevaluation), WATCHDOG_DEBUG);
 
-        $roleruleevaluationdc = explode(',', $roleruleevaluation);
+        $roleruleevaluationdc = str_getcsv($roleruleevaluation);
         if (!_simplesamlphp_auth_evaulaterolerule($roleruleevaluationdc, $attributes)) {
           $addnew = FALSE;
         }