diff --git a/Source/Project64-video/Renderer/OGLEScombiner.cpp b/Source/Project64-video/Renderer/OGLEScombiner.cpp
index f5edc7e12..a6c30e47b 100644
--- a/Source/Project64-video/Renderer/OGLEScombiner.cpp
+++ b/Source/Project64-video/Renderer/OGLEScombiner.cpp
@@ -1904,7 +1904,7 @@ void gfxColorCombineExt(gfxCCUColor_t a, gfxCombineMode_t a_mode, gfxCCUColor_t
     need_to_compile = 1;
 }
 
-void gfxAlphaCombineExt(GrACUColor_t a, gfxCombineMode_t a_mode, GrACUColor_t b, gfxCombineMode_t b_mode, GrACUColor_t c, FxBool c_invert, GrACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert)
+void gfxAlphaCombineExt(gfxACUColor_t a, gfxCombineMode_t a_mode, gfxACUColor_t b, gfxCombineMode_t b_mode, gfxACUColor_t c, FxBool c_invert, gfxACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert)
 {
     WriteTrace(TraceGlitch, TraceDebug, "a: %d a_mode: %d b: %d b_mode: %d c: %d c_invert: %d d: %d d_invert: %d shift: %d invert: %d", a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);
     if (invert) WriteTrace(TraceGlitch, TraceWarning, "gfxAlphaCombineExt : inverted result");
diff --git a/Source/Project64-video/Renderer/OGLcombiner.cpp b/Source/Project64-video/Renderer/OGLcombiner.cpp
index ba27089f2..0aacf1543 100644
--- a/Source/Project64-video/Renderer/OGLcombiner.cpp
+++ b/Source/Project64-video/Renderer/OGLcombiner.cpp
@@ -1867,7 +1867,7 @@ void gfxColorCombineExt(gfxCCUColor_t a, gfxCombineMode_t a_mode, gfxCCUColor_t
     need_to_compile = 1;
 }
 
-void gfxAlphaCombineExt(GrACUColor_t a, gfxCombineMode_t a_mode, GrACUColor_t b, gfxCombineMode_t b_mode, GrACUColor_t c, FxBool c_invert, GrACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert)
+void gfxAlphaCombineExt(gfxACUColor_t a, gfxCombineMode_t a_mode, gfxACUColor_t b, gfxCombineMode_t b_mode, gfxACUColor_t c, FxBool c_invert, gfxACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert)
 {
     WriteTrace(TraceGlitch, TraceDebug, "a: %d a_mode: %d b: %d b_mode: %d c: %d c_invert: %d d: %d d_invert: %d shift: %d invert: %d", a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);
     if (invert) WriteTrace(TraceGlitch, TraceWarning, "gfxAlphaCombineExt : inverted result");
diff --git a/Source/Project64-video/Renderer/Renderer.h b/Source/Project64-video/Renderer/Renderer.h
index 09b7cb318..acc2ad333 100644
--- a/Source/Project64-video/Renderer/Renderer.h
+++ b/Source/Project64-video/Renderer/Renderer.h
@@ -37,7 +37,7 @@ void gfxChromakeyMode(GrChromakeyMode_t mode);
 void gfxChromakeyValue(GrColor_t value);
 void gfxStippleMode(GrStippleMode_t mode);
 void gfxColorCombineExt(gfxCCUColor_t a, gfxCombineMode_t a_mode, gfxCCUColor_t b, gfxCombineMode_t b_mode, gfxCCUColor_t c, FxBool c_invert, gfxCCUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert);
-void gfxAlphaCombineExt(GrACUColor_t a, gfxCombineMode_t a_mode, GrACUColor_t b, gfxCombineMode_t b_mode, GrACUColor_t c, FxBool c_invert, GrACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert);
+void gfxAlphaCombineExt(gfxACUColor_t a, gfxCombineMode_t a_mode, gfxACUColor_t b, gfxCombineMode_t b_mode, gfxACUColor_t c, FxBool c_invert, gfxACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert);
 void gfxTexColorCombineExt(GrChipID_t tmu, GrTCCUColor_t a, gfxCombineMode_t a_mode, GrTCCUColor_t b, gfxCombineMode_t b_mode, GrTCCUColor_t c, FxBool c_invert, GrTCCUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert);
 void gfxTexAlphaCombineExt(GrChipID_t tmu, GrTACUColor_t a, gfxCombineMode_t a_mode, GrTACUColor_t b, gfxCombineMode_t b_mode, GrTACUColor_t c, FxBool c_invert, GrTACUColor_t d, FxBool d_invert, FxU32 shift, FxBool invert);
 void gfxConstantColorValueExt(GrChipID_t tmu, GrColor_t value);
diff --git a/Source/Project64-video/Renderer/types.h b/Source/Project64-video/Renderer/types.h
index dea790086..6f607af81 100644
--- a/Source/Project64-video/Renderer/types.h
+++ b/Source/Project64-video/Renderer/types.h
@@ -17,6 +17,7 @@
 
 typedef uint8_t gfxAlpha_t;
 typedef uint32_t gfxCCUColor_t;
+typedef uint32_t gfxACUColor_t;
 
 enum gfxCombineMode_t
 {