diff --git a/src/Interpreters/ExpressionActions.cpp b/src/Interpreters/ExpressionActions.cpp
index 13f30ce678c..4a448e9f463 100644
--- a/src/Interpreters/ExpressionActions.cpp
+++ b/src/Interpreters/ExpressionActions.cpp
@@ -1442,7 +1442,7 @@ ExpressionActionsPtr ActionsDAG::linearizeActions() const
     return expressions;
 }
 
-ExpressionActionsPtr ActionsDAG::buildExpressions()
+ExpressionActionsPtr ActionsDAG::buildExpressions() const
 {
     auto cloned = clone();
     auto expressions = cloned->linearizeActions();
diff --git a/src/Interpreters/ExpressionActions.h b/src/Interpreters/ExpressionActions.h
index c7011dd7d86..fefe64c8374 100644
--- a/src/Interpreters/ExpressionActions.h
+++ b/src/Interpreters/ExpressionActions.h
@@ -213,7 +213,7 @@ public:
 
     void projectInput() { project_input = true; }
     void removeUnusedActions(const Names & required_names);
-    ExpressionActionsPtr buildExpressions();
+    ExpressionActionsPtr buildExpressions() const;
 
     /// Splits actions into two parts. Returned half may be swapped with ARRAY JOIN.
     /// Returns nullptr if no actions may be moved before ARRAY JOIN.