diff --git a/include/mtl/test.hpp b/include/mtl/test.hpp
index f7a50ca..abd83b4 100644
--- a/include/mtl/test.hpp
+++ b/include/mtl/test.hpp
@@ -3,11 +3,11 @@
 #ifdef __GBA__
 
 #ifndef REG_TM2D
-#define REG_TM2D *(volatile uint32_t*)(0x04000108)
+#define REG_TM2D *(volatile uint16_t*)(0x04000108)
 #endif
 
 #ifndef REG_TM2CNT
-#define REG_TM2CNT *(volatile uint32_t*)(0x0400010A)
+#define REG_TM2CNT *(volatile uint16_t*)(0x0400010A)
 #endif
 
 #ifndef TM_ENABLE