diff --git a/src/component/gsc.cpp b/src/component/gsc.cpp
index 4fafc70..c80d737 100644
--- a/src/component/gsc.cpp
+++ b/src/component/gsc.cpp
@@ -270,7 +270,7 @@ namespace gsc
 
 	namespace field
 	{
-		void add(classid classnum, const std::string& name,
+		void add(const classid classnum, const std::string& name,
 			const std::function<scripting::script_value(unsigned int entnum)>& getter,
 			const std::function<void(unsigned int entnum, const scripting::script_value&)>& setter)
 		{
diff --git a/src/component/gsc.hpp b/src/component/gsc.hpp
index 31bdbca..7846caf 100644
--- a/src/component/gsc.hpp
+++ b/src/component/gsc.hpp
@@ -46,7 +46,7 @@ namespace gsc
 
 	namespace field
 	{
-		void add(classid classnum, const std::string& name,
+		void add(const classid classnum, const std::string& name,
 			const std::function<scripting::script_value(unsigned int entnum)>& getter,
 			const std::function<void(unsigned int entnum, const scripting::script_value&)>& setter);
 	}