diff --git a/src/main.c b/src/main.c
index 8d477e4f9..d942bdc28 100644
--- a/src/main.c
+++ b/src/main.c
@@ -194,7 +194,7 @@ s16 sNumVBlanks = 0;
 UNUSED s16 D_800DC590 = 0;
 f32 gVBlankTimer = 0.0f;
 f32 gCourseTimer = 0.0f;
-uint64_t gTickCounter;
+size_t gTickCounter;
 
 void create_thread(OSThread* thread, OSId id, void (*entry)(void*), void* arg, void* sp, OSPri pri) {
     thread->next = NULL;
diff --git a/src/main.h b/src/main.h
index c3a0a1236..e6430f347 100644
--- a/src/main.h
+++ b/src/main.h
@@ -225,7 +225,7 @@ extern s32 D_800DC56C[];
 extern s16 sNumVBlanks;
 extern f32 gVBlankTimer;
 extern f32 gCourseTimer;
-extern uint64_t gTickCounter;
+extern size_t gTickCounter;
 
 // end of definition of main.c variables