diff --git a/Core/sgb.h b/Core/sgb.h
index 4ed2bea..3069c36 100644
--- a/Core/sgb.h
+++ b/Core/sgb.h
@@ -7,6 +7,7 @@
 typedef struct GB_sgb_s GB_sgb_t;
 typedef struct {
     uint8_t tiles[0x100 * 8 * 4];
+#ifdef GB_INTERNAL
     union {
         struct {
             uint16_t map[32 * 32];
@@ -14,6 +15,9 @@ typedef struct {
         };
         uint16_t raw_data[0x440];
     };
+#else
+    uint16_t raw_data[0x440];
+#endif
 } GB_sgb_border_t;
 
 #ifdef GB_INTERNAL