diff --git a/url.c b/url.c
index 7cebc6471b1aea..6a5495960f03de 100644
--- a/url.c
+++ b/url.c
@@ -132,3 +132,10 @@ void end_url_with_slash(struct strbuf *buf, const char *url)
 	if (buf->len && buf->buf[buf->len - 1] != '/')
 		strbuf_addstr(buf, "/");
 }
+
+void str_end_url_with_slash(const char *url, char **dest) {
+	struct strbuf buf = STRBUF_INIT;
+	end_url_with_slash(&buf, url);
+	free(*dest);
+	*dest = strbuf_detach(&buf, NULL);
+}
diff --git a/url.h b/url.h
index 8cb74d4a0a8b30..7100e3215a97b2 100644
--- a/url.h
+++ b/url.h
@@ -8,5 +8,6 @@ extern char *url_decode_parameter_name(const char **query);
 extern char *url_decode_parameter_value(const char **query);
 
 extern void end_url_with_slash(struct strbuf *buf, const char *url);
+extern void str_end_url_with_slash(const char *url, char **dest);
 
 #endif /* URL_H */