diff --git a/referralsources.module b/referralsources.module
index 4c22181..a5a4ac3 100644
--- a/referralsources.module
+++ b/referralsources.module
@@ -367,7 +367,7 @@ function referralsources_select_options($flat = FALSE) {
     // Return grouped array of options for select list.
     $return = $options;
     // Add "Please select one..." option to beginning of select list.
-    $return = array_merge(array('' => array('' => t('Please select one...'))), $return);
+    $return = array('' => array('' => t('Please select one...'))) + $return;
     // Add "Other" option to end of select list.
     $return['Other']['OTHER'] = t('Other (please specify below)');
   }