diff --git a/src/emu/eminline.h b/src/emu/eminline.h
index 992a5039cf9..b6ae6fce342 100644
--- a/src/emu/eminline.h
+++ b/src/emu/eminline.h
@@ -155,8 +155,9 @@ INLINE UINT32 divu_64x32(UINT64 a, UINT32 b)
 #ifndef div_64x32_rem
 INLINE INT32 div_64x32_rem(INT64 a, INT32 b, INT32 *remainder)
 {
-	*remainder = a % (INT64)b;
-	return a / (INT64)b;
+	INT32 res = div_64x32(a, b);
+	*remainder = a - ((INT64)b * res);
+	return res;
 }
 #endif
 
@@ -170,8 +171,9 @@ INLINE INT32 div_64x32_rem(INT64 a, INT32 b, INT32 *remainder)
 #ifndef divu_64x32_rem
 INLINE UINT32 divu_64x32_rem(UINT64 a, UINT32 b, UINT32 *remainder)
 {
-	*remainder = a % (UINT64)b;
-	return a / (UINT64)b;
+	UINT32 res = divu_64x32(a, b);
+	*remainder = a - ((UINT64)b * res);
+	return res;
 }
 #endif
 
@@ -212,7 +214,7 @@ INLINE UINT32 divu_32x32_shift(UINT32 a, UINT32 b, UINT8 shift)
 #ifndef mod_64x32
 INLINE INT32 mod_64x32(INT64 a, INT32 b)
 {
-	return a % (INT64)b;
+	return a - (b * div_64x32(a, b));
 }
 #endif
 
@@ -225,7 +227,7 @@ INLINE INT32 mod_64x32(INT64 a, INT32 b)
 #ifndef modu_64x32
 INLINE UINT32 modu_64x32(UINT64 a, UINT32 b)
 {
-	return a % (UINT64)b;
+	return a - (b * divu_64x32(a, b));
 }
 #endif