diff --git a/PVRTCEncoder/src/Pixel.h b/PVRTCEncoder/src/Pixel.h
index 6e6f06c..f9ad76e 100644
--- a/PVRTCEncoder/src/Pixel.h
+++ b/PVRTCEncoder/src/Pixel.h
@@ -89,10 +89,10 @@ class Pixel {
  private:
   union {
     struct {
+      uint8 m_A;
       uint8 m_R;
       uint8 m_G;
       uint8 m_B;
-      uint8 m_A;
     };
     uint8 m_Component[4];
   };