diff --git a/VM/src/lbuiltins.cpp b/VM/src/lbuiltins.cpp
index 04852e87..e5e2bac6 100644
--- a/VM/src/lbuiltins.cpp
+++ b/VM/src/lbuiltins.cpp
@@ -1374,7 +1374,8 @@ static int luauF_writeinteger(lua_State* L, StkId res, TValue* arg0, int nresult
             return -1;
 
         unsigned value;
-        luai_num2unsigned(value, nvalue(args + 1));
+        double incoming = nvalue(args + 1);
+        luai_num2unsigned(value, incoming);
 
         T val = T(value);
         memcpy((char*)bufvalue(arg0)->data + offset, &val, sizeof(T));
diff --git a/VM/src/lnumutils.h b/VM/src/lnumutils.h
index 9abe0335..38bfb322 100644
--- a/VM/src/lnumutils.h
+++ b/VM/src/lnumutils.h
@@ -53,9 +53,8 @@ LUAU_FASTMATH_END
 #if defined(_MSC_VER) && defined(_M_IX86)
 #define luai_num2unsigned(i, n) \
     { \
-        double v = (n); \
         __int64 l; \
-        __asm { __asm fld v __asm fistp l} \
+        __asm { __asm fld n __asm fistp l} \
         ; \
         i = (unsigned int)l; \
     }