diff --git a/src/formula_function.cpp b/src/formula_function.cpp
index e5d59b101ba..955c1d1fb57 100644
--- a/src/formula_function.cpp
+++ b/src/formula_function.cpp
@@ -795,7 +795,6 @@ public:
 	{}
 private:
 	variant execute(const formula_callable& variables, formula_debugger *fdb) const {
-		std::map<variant,variant> map_vars;
 		const variant items = args()[0]->evaluate(variables,fdb);
 
 		if(items.num_elements() == 0)