diff --git a/desmume/src/matrix.h b/desmume/src/matrix.h
index b4795b2f1..2ee9cb82e 100644
--- a/desmume/src/matrix.h
+++ b/desmume/src/matrix.h
@@ -744,7 +744,7 @@ static void memset_u32_fast(void *dst, const u32 val)
 template <size_t VECLENGTH>
 static void buffer_copy_fast(void *__restrict dst, void *__restrict src)
 {
-	MACRODO_N( VECLENGTH / sizeof(v128s8), vec_st(vec_ld((X)*sizeof(v128s8),src), (X)*sizeof(v128s8), dst) );
+	MACRODO_N( VECLENGTH / sizeof(v128s8), vec_st(vec_ld((X)*sizeof(v128s8),(u8 *__restrict)src), (X)*sizeof(v128s8), (u8 *__restrict)dst) );
 }
 
 template <size_t VECLENGTH>
@@ -752,7 +752,7 @@ static void stream_copy_fast(void *__restrict dst, void *__restrict src)
 {
 	// AltiVec doesn't have the same temporal/caching distinctions that SSE and AVX do,
 	// so just use buffer_copy_fast() for this function too.
-	buffer_copy_fast<VECLENGTH>(dst, src, VECLENGTH);
+	buffer_copy_fast<VECLENGTH>(dst, src);
 }
 
 template <class T, size_t VECLENGTH, bool NEEDENDIANSWAP>