diff --git a/webform_addressfield_extra.module b/webform_addressfield_extra.module
index 7299fb1..1536d8c 100644
--- a/webform_addressfield_extra.module
+++ b/webform_addressfield_extra.module
@@ -330,6 +330,8 @@ function _webform_addressfield_extra_geocomplete_url($api_key = FALSE) {
     ),
     'external'  => TRUE
   );
+  // Allow other modules to set or override API key.
+  drupal_alter('webform_addressfield_extra_api_key', $api_key);
   if ($api_key) {
     $options['query']['key'] = $api_key;
   }