diff --git a/libyul/optimiser/BlockHasher.h b/libyul/optimiser/BlockHasher.h
index bdc27424e..6dc55371c 100644
--- a/libyul/optimiser/BlockHasher.h
+++ b/libyul/optimiser/BlockHasher.h
@@ -138,7 +138,7 @@ struct ExpressionHash
 {
 	uint64_t operator()(Expression const& _expression) const
 	{
-		return ExpressionHasher{}.run(_expression);
+		return ExpressionHasher::run(_expression);
 	}
 };
 
diff --git a/libyul/optimiser/CommonSubexpressionEliminator.cpp b/libyul/optimiser/CommonSubexpressionEliminator.cpp
index be3c3c524..93589f1a4 100644
--- a/libyul/optimiser/CommonSubexpressionEliminator.cpp
+++ b/libyul/optimiser/CommonSubexpressionEliminator.cpp
@@ -134,11 +134,6 @@ void CommonSubexpressionEliminator::assignValue(YulString _variable, Expression
 	DataFlowAnalyzer::assignValue(_variable, _value);
 }
 
-uint64_t CommonSubexpressionEliminator::ExpressionHash::operator()(Expression const& _e) const
-{
-	return ExpressionHasher::run(_e);
-}
-
 bool CommonSubexpressionEliminator::ExpressionEqual::operator()(Expression const& _a, Expression const& _b) const
 {
 	return SyntacticallyEqual{}(_a, _b);
diff --git a/libyul/optimiser/CommonSubexpressionEliminator.h b/libyul/optimiser/CommonSubexpressionEliminator.h
index f0a42be01..dda790a13 100644
--- a/libyul/optimiser/CommonSubexpressionEliminator.h
+++ b/libyul/optimiser/CommonSubexpressionEliminator.h
@@ -24,6 +24,7 @@
 
 #include <libyul/optimiser/DataFlowAnalyzer.h>
 #include <libyul/optimiser/OptimiserStep.h>
+#include <libyul/optimiser/BlockHasher.h>
 
 #include <set>
 
@@ -60,9 +61,6 @@ protected:
 
 	void assignValue(YulString _variable, Expression const* _value) override;
 private:
-	struct ExpressionHash {
-		uint64_t operator()(Expression const&) const;
-	};
 	struct ExpressionEqual {
 		bool operator()(Expression const&, Expression const&) const;
 	};