diff --git a/src/Forms/GridField/GridFieldAddByDBField.php b/src/Forms/GridField/GridFieldAddByDBField.php
index ff5509e..9561305 100644
--- a/src/Forms/GridField/GridFieldAddByDBField.php
+++ b/src/Forms/GridField/GridFieldAddByDBField.php
@@ -234,6 +234,6 @@ class GridFieldAddByDBField implements GridField_ActionProvider, GridField_HTMLP
         $forTemplate->Fields->push($textField);
         $forTemplate->Fields->push($addAction);
 
-        return [$this->targetFragment => $forTemplate->renderWith(self::class)];
+        return [$this->targetFragment => $forTemplate->renderWith(GridFieldAddByDBField::class)];
     }
 }
diff --git a/src/Model/Blog.php b/src/Model/Blog.php
index d3aeec9..c843997 100644
--- a/src/Model/Blog.php
+++ b/src/Model/Blog.php
@@ -475,7 +475,7 @@ class Blog extends Page implements PermissionProvider
             return $extended;
         }
 
-        return Permission::checkMember($member, self::MANAGE_USERS);
+        return Permission::checkMember($member, Blog::MANAGE_USERS);
     }
 
     /**
@@ -499,7 +499,7 @@ class Blog extends Page implements PermissionProvider
             return true;
         }
 
-        return Permission::checkMember($member, self::MANAGE_USERS);
+        return Permission::checkMember($member, Blog::MANAGE_USERS);
     }
 
     /**
@@ -523,7 +523,7 @@ class Blog extends Page implements PermissionProvider
             return true;
         }
 
-        return Permission::checkMember($member, self::MANAGE_USERS);
+        return Permission::checkMember($member, Blog::MANAGE_USERS);
     }
 
     /**