diff --git a/src/main/edu/wisc/doit/uwphps/preauth/FederatedPreauthUserDetailsProvider.php b/src/main/edu/wisc/doit/uwphps/preauth/FederatedPreauthUserDetailsProvider.php
index 48dfdf1c0e202faba715a96eaa0a03cd20cd74d6..1dd0dd888111821dbf291d1bab5e8ed0130d210f 100644
--- a/src/main/edu/wisc/doit/uwphps/preauth/FederatedPreauthUserDetailsProvider.php
+++ b/src/main/edu/wisc/doit/uwphps/preauth/FederatedPreauthUserDetailsProvider.php
@@ -27,8 +27,8 @@ class FederatedPreauthUserDetailsProvider extends UserDetailsProvider
     public function loadUser()
     {
         // Return null if no Shib session is found
-        if ($this->httpHeaders && !getenv(static::SHIB_SESSION_ID_HTTP) ||
-            !$this->httpHeaders && !getenv(static::SHIB_SESSION_ID)) {
+        if (($this->httpHeaders && !getenv(static::SHIB_SESSION_ID_HTTP)) ||
+            (!$this->httpHeaders && !getenv(static::SHIB_SESSION_ID))) {
             return null;
         }
 
diff --git a/src/main/edu/wisc/doit/uwphps/preauth/PreauthUserDetailsProvider.php b/src/main/edu/wisc/doit/uwphps/preauth/PreauthUserDetailsProvider.php
index 31f826116c9ce2d19bd6a748c713aa0ec6d990c9..58b647d158606f979b097b17b9f644ba8af0ccc7 100644
--- a/src/main/edu/wisc/doit/uwphps/preauth/PreauthUserDetailsProvider.php
+++ b/src/main/edu/wisc/doit/uwphps/preauth/PreauthUserDetailsProvider.php
@@ -29,8 +29,8 @@ class PreauthUserDetailsProvider extends UserDetailsProvider
     public function loadUser()
     {
         // Return null if no Shib session is found
-        if ($this->httpHeaders && !getenv(static::SHIB_SESSION_ID_HTTP) ||
-            !$this->httpHeaders && !getenv(static::SHIB_SESSION_ID)) {
+        if (($this->httpHeaders && !getenv(static::SHIB_SESSION_ID_HTTP)) ||
+            (!$this->httpHeaders && !getenv(static::SHIB_SESSION_ID))) {
             return null;
         }