1 files changed, 3 insertions, 3 deletions

diff --git a/src/lj_vmmath.c b/src/lj_vmmath.c
index d0febd81..4fa79ae4 100644
--- a/src/lj_vmmath.c
+++ b/src/lj_vmmath.c
@@ -75,11 +75,11 @@ int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
   uint32_t y, ua, ub;
   /* This must be checked before using this function. */
   lj_assertX(b != 0, "modulo with zero divisor");
-  ua = a < 0 ? (uint32_t)-a : (uint32_t)a;
-  ub = b < 0 ? (uint32_t)-b : (uint32_t)b;
+  ua = a < 0 ? ~(uint32_t)a+1u : (uint32_t)a;
+  ub = b < 0 ? ~(uint32_t)b+1u : (uint32_t)b;
   y = ua % ub;
   if (y != 0 && (a^b) < 0) y = y - ub;
-  if (((int32_t)y^b) < 0) y = (uint32_t)-(int32_t)y;
+  if (((int32_t)y^b) < 0) y = ~y+1u;
   return (int32_t)y;
 }
 #endif