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-rw-r--r--src/stdlib/strtoul.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/stdlib/strtoul.c b/src/stdlib/strtoul.c
index 951d5e8c..20d8bfb2 100644
--- a/src/stdlib/strtoul.c
+++ b/src/stdlib/strtoul.c
@@ -5,8 +5,11 @@
 
 unsigned long strtoul(const char *s, char **p, int base)
 {
-	uintmax_t x = strtoumax(s, p, base);
-	if (x > ULONG_MAX) {
+	intmax_t x;
+	if (sizeof(intmax_t) == sizeof(long))
+		return strtoumax(s, p, base);
+	x = strtoimax(s, p, base);
+	if (-x > ULONG_MAX || x > ULONG_MAX) {
 		errno = ERANGE;
 		return ULONG_MAX;
 	}