diff --git a/src/gx/CGxMatrixStack.hpp b/src/gx/CGxMatrixStack.hpp
index 80ce9cc..fd54109 100644
--- a/src/gx/CGxMatrixStack.hpp
+++ b/src/gx/CGxMatrixStack.hpp
@@ -19,9 +19,9 @@ class CGxMatrixStack {
 
         // Member functions
         CGxMatrixStack();
-        void Pop(void);
-        void Push(void);
-        C44Matrix& Top(void);
+        void Pop();
+        void Push();
+        C44Matrix& Top();
         const C44Matrix& TopConst();
 };