1 files changed, 1 insertions, 0 deletions
diff --git a/string.c b/string.c
index 3d864e54b5..246599d050 100644
--- a/string.c
+++ b/string.c
@@ -6876,6 +6876,7 @@ rb_str_partition(VALUE str, VALUE sep)
 	    rb_raise(rb_eTypeError, "type mismatch: %s given",
 		     rb_obj_classname(sep));
 	}
+	sep = tmp;
 	pos = rb_str_index(str, sep, 0);
     }
     if (pos < 0) {