diff --git a/src/cache_bin.c b/src/cache_bin.c
index c3b94e54..0454dbde 100644
--- a/src/cache_bin.c
+++ b/src/cache_bin.c
@@ -12,7 +12,7 @@ cache_bin_info_init(cache_bin_info_t *info,
     cache_bin_sz_t ncached_max) {
 	assert(ncached_max <= CACHE_BIN_NCACHED_MAX);
 	size_t stack_size = (size_t)ncached_max * sizeof(void *);
-	assert(stack_size <= UINT16_MAX);
+	assert(stack_size < ((size_t)1 << (sizeof(cache_bin_sz_t) * 8)));
 	info->ncached_max = (cache_bin_sz_t)ncached_max;
 }