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-rw-r--r--random.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/random.c b/random.c
index 3be22a4ec0..1093a103c1 100644
--- a/random.c
+++ b/random.c
@@ -991,7 +991,11 @@ random_ulong_limited(VALUE obj, rb_random_t *rnd, unsigned long limit)
const int w = sizeof(limit) * CHAR_BIT - nlz_long(limit);
const int n = w > 32 ? sizeof(unsigned long) : sizeof(uint32_t);
const unsigned long mask = ~(~0UL << w);
- const unsigned long full = ~(~0UL << n * CHAR_BIT);
+ const unsigned long full =
+#if SIZEOF_LONG == 4
+ (size_t)n >= sizeof(unsigned long) ? ~0UL :
+#endif
+ ~(~0UL << n * CHAR_BIT);
unsigned long val, bits = 0, rest = 0;
do {
if (mask & ~rest) {