diff --git a/libyul/optimiser/DataFlowAnalyzer.cpp b/libyul/optimiser/DataFlowAnalyzer.cpp
index 1aecd6bd4a91..e9e89cd9042e 100644
--- a/libyul/optimiser/DataFlowAnalyzer.cpp
+++ b/libyul/optimiser/DataFlowAnalyzer.cpp
@@ -147,7 +147,6 @@ void DataFlowAnalyzer::operator()(Switch& _switch)
 		clearKnowledgeIfInvalidated(_case.body);
 	}
 	for (auto& _case: _switch.cases)
-		clearKnowledgeIfInvalidated(_case.body);
 	clearValues(assignedVariables);
 }