1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index bbd23669e6..6cf76e4fd4 100644
--- a/string.c
+++ b/string.c
@@ -9124,7 +9124,7 @@ rb_str_partition(VALUE str, VALUE sep)
 	pos = rb_reg_search(sep, str, 0, 0);
 	if (pos < 0) {
 	  failed:
-	    return rb_ary_new3(3, str, str_new_empty(str), str_new_empty(str));
+	    return rb_ary_new3(3, rb_str_dup(str), str_new_empty(str), str_new_empty(str));
 	}
 	sep = rb_str_subpat(str, sep, INT2FIX(0));
 	if (pos == 0 && RSTRING_LEN(sep) == 0) goto failed;