diff --git a/include/nitro/pxi/common/fifo.h b/include/nitro/pxi/common/fifo.h
index 25ff4c8..0d6d965 100644
--- a/include/nitro/pxi/common/fifo.h
+++ b/include/nitro/pxi/common/fifo.h
@@ -113,6 +113,7 @@ typedef enum
     PXI_FIFO_TAG_CTRDG_PHI,            // Cartridge PHI
     PXI_FIFO_TAG_AES,                  // AES
     PXI_FIFO_TAG_CAMERA,               // Camera
+    PXI_FIFO_TAG_GCD,                  // Card Ex
 
     PXI_MAX_FIFO_TAG = 32              // MAX FIFO TAG
 }