diff --git a/sources/ParserMain.cpp b/sources/ParserMain.cpp
index 29650257..d3868645 100644
--- a/sources/ParserMain.cpp
+++ b/sources/ParserMain.cpp
@@ -14,7 +14,7 @@ public:
     int getNumMasters() const noexcept { return numMasters; }
     int getNumCurves() const noexcept { return numCurves; }
 protected:
-    void callback(std::string_view header, std::vector<sfz::Opcode> members) final
+    void callback(std::string_view header, std::vector<sfz::Opcode> members [[maybe_unused]]) final
     {
         switch (hash(header))
         {