diff --git a/c-programming/math/opt_int_div.h b/c-programming/math/opt_int_div.h
index 0484269..71031b9 100644
--- a/c-programming/math/opt_int_div.h
+++ b/c-programming/math/opt_int_div.h
@@ -23,7 +23,7 @@
 #define INT_BIN_DIV(a, b) ((a) >> (uintmax_t) log2l((b)))
 #define INT_DIV_NEG_RESULT_SIGN(a, b)                                         \
     /* the sign is negative only if one of the numbers is negative */         \
-    (((a) < 0) ^ ((b) < 0)) /* 1 if sign is negative else 0 */
+    (((a) < 0) != ((b) < 0)) /* 1 if sign is negative else 0 */
 #define INT_ABS(x) ((x) < 0 ? -(x) : (x))
 #define LOG2_DEC_PORTION(b) fmodl(log2l(INT_ABS((b))), 1.l)
 #define OPT_INT_DIV_TEST(b)                                                   \