diff --git a/src/Analyser/MutatingScope.php b/src/Analyser/MutatingScope.php
index 5a07151b15..93517ed649 100644
--- a/src/Analyser/MutatingScope.php
+++ b/src/Analyser/MutatingScope.php
@@ -5637,8 +5637,6 @@ private function compareVariableTypeHolders(array $variableTypeHolders, array $o
 			if (!$variableTypeHolder->getType()->equals($otherVariableTypeHolders[$variableExprString]->getType())) {
 				return false;
 			}
-
-			unset($otherVariableTypeHolders[$variableExprString]);
 		}
 
 		return true;