diff --git a/include/simdjson/portability.h b/include/simdjson/portability.h
index 833b09740..77187f2ef 100644
--- a/include/simdjson/portability.h
+++ b/include/simdjson/portability.h
@@ -46,7 +46,7 @@ static inline int hamming(uint64_t input_num) {
 #include <cstdint>
 
 static inline bool add_overflow(uint64_t  value1, uint64_t  value2, uint64_t *result) {
-	return __builtin_uaddl_overflow(value1, value2, (unsigned long *)result);
+	return __builtin_uaddll_overflow(value1, value2, (unsigned long long*)result);
 }
 static inline bool mul_overflow(uint64_t  value1, uint64_t  value2, uint64_t *result) {
 	return __builtin_umulll_overflow(value1, value2, (unsigned long long *)result);
diff --git a/src/stage1_find_marks.cpp b/src/stage1_find_marks.cpp
index 2b3231c16..37b0b6f30 100644
--- a/src/stage1_find_marks.cpp
+++ b/src/stage1_find_marks.cpp
@@ -99,7 +99,7 @@ WARN_UNUSED
     // indicates whether the sense of any edge going to the next iteration
     // should be flipped
     bool iter_ends_odd_backslash =
-		add_overflow(bs_bits, odd_starts, (unsigned long long *) &odd_carries);
+		add_overflow(bs_bits, odd_starts, &odd_carries);
 
     odd_carries |=
         prev_iter_ends_odd_backslash; // push in bit zero as a potential end