1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index 8e494dbb83..ade48c65bd 100644
--- a/string.c
+++ b/string.c
@@ -2073,7 +2073,7 @@ rb_str_prepend(VALUE str, VALUE str2)
 st_index_t
 rb_memhash(const void *ptr, long len)
 {
-    return st_hash(ptr, len, rb_hash_start(0));
+    return st_hash(ptr, len, rb_hash_start((st_index_t)len));
 }
 
 st_index_t