1 files changed, 1 insertions, 1 deletions
diff --git a/intern.h b/intern.h
index 963571360f..95f3ad517f 100644
--- a/intern.h
+++ b/intern.h
@@ -57,7 +57,7 @@ VALUE rb_big_and _((VALUE, VALUE));
 VALUE rb_big_or _((VALUE, VALUE));
 VALUE rb_big_xor _((VALUE, VALUE));
 VALUE rb_big_lshift _((VALUE, VALUE));
-VALUE rb_big_rand _((VALUE));
+VALUE rb_big_rand _((VALUE, double));
 /* class.c */
 VALUE rb_class_new _((VALUE));
 VALUE rb_singleton_class_new _((VALUE));