diff --git a/src/0xc/std/pointer.c b/src/0xc/std/pointer.c
index 25e71e5..cc96fa0 100644
--- a/src/0xc/std/pointer.c
+++ b/src/0xc/std/pointer.c
@@ -58,7 +58,7 @@ ptrtag_t
 __pointer_get_max_taggable(void)
 {
 	size_t total = POINTER_TAG_BITS_HI + POINTER_TAG_BITS_LO;
-	return (ptrtag_t)((1 << total) - 1);
+	return (ptrtag_t)((1ULL << total) - 1);
 }
 
 tagptr_t