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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 03440bf..d632f57 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -971,7 +971,7 @@ struct RHash {
#define RHASH_TBL(h) rb_hash_tbl(h)
#define RHASH_ITER_LEV(h) (RHASH(h)->iter_lev)
#define RHASH_IFNONE(h) (RHASH(h)->ifnone)
-#define RHASH_SIZE(h) (RHASH(h)->ntbl ? RHASH(h)->ntbl->num_entries : 0)
+#define RHASH_SIZE(h) (RHASH(h)->ntbl ? (st_index_t)RHASH(h)->ntbl->num_entries : 0)
#define RHASH_EMPTY_P(h) (RHASH_SIZE(h) == 0)
#define RHASH_SET_IFNONE(h, ifnone) rb_hash_set_ifnone((VALUE)h, ifnone)