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-rw-r--r--src/stdlib/wcstoull.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/stdlib/wcstoull.c b/src/stdlib/wcstoull.c
index e324dfb2..48c557db 100644
--- a/src/stdlib/wcstoull.c
+++ b/src/stdlib/wcstoull.c
@@ -6,8 +6,11 @@
 
 unsigned long long wcstoull(const wchar_t *s, wchar_t **p, int base)
 {
-	uintmax_t x = wcstoumax(s, p, base);
-	if (x > ULLONG_MAX) {
+ 	intmax_t x;
+	if (sizeof(intmax_t) == sizeof(long long))
+		return wcstoumax(s, p, base);
+	x = wcstoimax(s, p, base);
+	if (-x > ULLONG_MAX || x > ULLONG_MAX) {
 		errno = ERANGE;
 		return ULLONG_MAX;
 	}