diff --git a/desmume/src/gfx3d.cpp b/desmume/src/gfx3d.cpp
index f4c9a18b1..d89e0ef9c 100644
--- a/desmume/src/gfx3d.cpp
+++ b/desmume/src/gfx3d.cpp
@@ -323,7 +323,7 @@ static u32 clCmd = 0;
 static u32 clInd = 0;
 
 static u32 clInd2 = 0;
-BOOL isSwapBuffers = FALSE;
+u32 isSwapBuffers = FALSE;
 
 static u32 BTind = 0;
 static u32 PTind = 0;
diff --git a/desmume/src/gfx3d.h b/desmume/src/gfx3d.h
index d1d78a8cb..714e547a5 100644
--- a/desmume/src/gfx3d.h
+++ b/desmume/src/gfx3d.h
@@ -616,7 +616,7 @@ extern GFX3D gfx3d;
 extern CACHE_ALIGN u32 dsDepthExtend_15bit_to_24bit[32768];
 extern CACHE_ALIGN u8 mixTable555[32][32][32];
 
-extern BOOL isSwapBuffers;
+extern u32 isSwapBuffers;
 
 void gfx3d_glFlush(u32 v);
 // end GE commands