diff --git a/gba/cartest/src/cartest.cpp b/gba/cartest/src/cartest.cpp
index 05d4f11..2ccc7bd 100644
--- a/gba/cartest/src/cartest.cpp
+++ b/gba/cartest/src/cartest.cpp
@@ -16,6 +16,7 @@
 #include "car_bin.h"
 #include "car_blue_bin.h"
 #include "smoke_bin.h"
+#include "spriteloader.h"
 
 #include "sinlut.h"
 
@@ -158,23 +159,6 @@ public:
   int speed, angle;
 };
 
-class SpriteLoader {
-  u32 free_space;
-  u16 sprite_index;
-public:
-  SpriteLoader() {
-    free_space = (u32)BITMAP_OBJ_BASE_ADR;
-    sprite_index = 512;
-  }
-  u16 load_from_memory(const void *source, u8 blocks) {
-    int bytes = blocks*8;
-    CpuFastSet(source, (void*)free_space, COPY32 | bytes/4);
-    free_space += bytes;
-    u16 pre_index = sprite_index;
-    sprite_index += blocks * 2 / 8;
-    return pre_index;
-  }
-};
 
 int main(void)
 {
diff --git a/gba/cartest/src/spriteloader.cpp b/gba/cartest/src/spriteloader.cpp
new file mode 100644
index 0000000..cae3e1b
--- /dev/null
+++ b/gba/cartest/src/spriteloader.cpp
@@ -0,0 +1,17 @@
+#include "spriteloader.h"
+#include "gba_sprites.h"
+#include "gba_systemcalls.h"
+
+SpriteLoader::SpriteLoader() {
+  free_space = (u32)BITMAP_OBJ_BASE_ADR;
+  sprite_index = 512;
+}
+
+u16 SpriteLoader::load_from_memory(const void *source, u8 blocks) {
+  int bytes = blocks*8;
+  CpuFastSet(source, (void*)free_space, COPY32 | bytes/4);
+  free_space += bytes;
+  u16 pre_index = sprite_index;
+  sprite_index += blocks * 2 / 8;
+  return pre_index;
+}
diff --git a/gba/cartest/src/spriteloader.h b/gba/cartest/src/spriteloader.h
new file mode 100644
index 0000000..a456ce9
--- /dev/null
+++ b/gba/cartest/src/spriteloader.h
@@ -0,0 +1,14 @@
+#ifndef SPRITELOADER_H
+#define SPRITELOADER_H
+
+#include "gba_types.h"
+
+class SpriteLoader {
+  u32 free_space;
+  u16 sprite_index;
+public:
+  SpriteLoader();
+  u16 load_from_memory(const void *source, u8 blocks);
+};
+
+#endif