src/ResourceType/ResourceType.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ResourceType/ResourceType.php b/src/ResourceType/ResourceType.php
index 8b3b98c..532e577 100644
--- a/src/ResourceType/ResourceType.php
+++ b/src/ResourceType/ResourceType.php
@@ -142,7 +142,7 @@ class ResourceType {
     // By default the entity field name is the public field name. Unless: see
     // ::getPublicName().
     if ($field_name === "{$this->entityTypeId}_id" || $field_name === "{$this->entityTypeId}_type") {
-      return substr($field_name, strlen($this->entityTypeId));
+      return substr($field_name, strlen($this->entityTypeId) + 1);
     }
 
     return $field_name;