diff --git a/src/mathed/MathMacroTemplate.cpp b/src/mathed/MathMacroTemplate.cpp
index b36bf19d15..f7214cb5b3 100644
--- a/src/mathed/MathMacroTemplate.cpp
+++ b/src/mathed/MathMacroTemplate.cpp
@@ -775,7 +775,7 @@ class NullMacroInstanceFix
 {
 public:
 	///
-	void operator()(MathMacro * macro) {}
+	void operator()(MathMacro * ) {}
 };