diff --git a/src/bg.c b/src/bg.c
index 54ec3b347..f73f5998d 100644
--- a/src/bg.c
+++ b/src/bg.c
@@ -246,7 +246,7 @@ void SetTextModeAndHideBgs(void)
     SetGpuReg(REG_OFFSET_DISPCNT, GetGpuReg(REG_OFFSET_DISPCNT) & ~DISPCNT_ALL_BG_AND_MODE_BITS);
 }
 
-static void SetBgAffineInternal(u8 bg, u32 srcCenterX, u32 srcCenterY, s16 dispCenterX, s16 dispCenterY, s16 scaleX, s16 scaleY, u16 rotationAngle)
+static void SetBgAffineInternal(u8 bg, s32 srcCenterX, s32 srcCenterY, s16 dispCenterX, s16 dispCenterY, s16 scaleX, s16 scaleY, u16 rotationAngle)
 {
     struct BgAffineSrcData src;
     struct BgAffineDstData dest;
@@ -777,7 +777,7 @@ s32 GetBgY(u8 bg)
         return sGpuBgConfigs2[bg].bg_y;
 }
 
-void SetBgAffine(u8 bg, u32 srcCenterX, u32 srcCenterY, s16 dispCenterX, s16 dispCenterY, s16 scaleX, s16 scaleY, u16 rotationAngle)
+void SetBgAffine(u8 bg, s32 srcCenterX, s32 srcCenterY, s16 dispCenterX, s16 dispCenterY, s16 scaleX, s16 scaleY, u16 rotationAngle)
 {
     SetBgAffineInternal(bg, srcCenterX, srcCenterY, dispCenterX, dispCenterY, scaleX, scaleY, rotationAngle);
 }