diff --git a/src/Standards/Typo3Update/Sniffs/Legacy/ClassnamesSniff.php b/src/Standards/Typo3Update/Sniffs/Legacy/ClassnamesSniff.php
index bae9950..d9993ae 100644
--- a/src/Standards/Typo3Update/Sniffs/Legacy/ClassnamesSniff.php
+++ b/src/Standards/Typo3Update/Sniffs/Legacy/ClassnamesSniff.php
@@ -99,7 +99,7 @@ class Typo3Update_Sniffs_Legacy_ClassnamesSniff implements PHP_CodeSniffer_Sniff
                 break;
 
             default:
-
+                throw new \RuntimeException('Could not fix type "' . $tokens[$stackPtr]['type'] . '"', 1488891438);
                 break;
         }
     }