diff --git a/src/gx/CGxMatrixStack.cpp b/src/gx/CGxMatrixStack.cpp
index d284464..1efb83b 100644
--- a/src/gx/CGxMatrixStack.cpp
+++ b/src/gx/CGxMatrixStack.cpp
@@ -1,7 +1,7 @@
 #include "gx/CGxMatrixStack.hpp"
 
 CGxMatrixStack::CGxMatrixStack() {
-    this->m_flags[0] = 0x1;
+    this->m_flags[0] = F_Identity;
 }
 
 void CGxMatrixStack::Pop() {
@@ -25,7 +25,7 @@ void CGxMatrixStack::Push() {
 
 C44Matrix& CGxMatrixStack::Top() {
     this->m_dirty = 1;
-    this->m_flags[this->m_level] &= 0xFFFFFFFE;
+    this->m_flags[this->m_level] &= ~F_Identity;
     return this->m_mtx[this->m_level];
 }
 
diff --git a/src/gx/CGxMatrixStack.hpp b/src/gx/CGxMatrixStack.hpp
index 7bb2381..80ce9cc 100644
--- a/src/gx/CGxMatrixStack.hpp
+++ b/src/gx/CGxMatrixStack.hpp
@@ -6,6 +6,11 @@
 
 class CGxMatrixStack {
     public:
+        // Types
+        enum EMatrixFlags {
+            F_Identity = 0x1,
+        };
+
         // Member variables
         uint32_t m_level = 0;
         int8_t m_dirty = 0;