diff --git a/cgit.h b/cgit.h
index 7619cbb..3e9d55b 100644
--- a/cgit.h
+++ b/cgit.h
@@ -304,6 +304,8 @@ extern char *ensure_end(const char *str, char c);
 extern char *strlpart(char *txt, int maxlen);
 extern char *strrpart(char *txt, int maxlen);
 
+extern void strbuf_ensure_end(struct strbuf *sb, char c);
+
 extern void cgit_add_ref(struct reflist *list, struct refinfo *ref);
 extern void cgit_free_reflist_inner(struct reflist *list);
 extern int cgit_refs_cb(const char *refname, const unsigned char *sha1,
diff --git a/shared.c b/shared.c
index 1fa9c99..10be355 100644
--- a/shared.c
+++ b/shared.c
@@ -130,6 +130,12 @@ char *ensure_end(const char *str, char c)
 	return result;
 }
 
+void strbuf_ensure_end(struct strbuf *sb, char c)
+{
+	if (!sb->len || sb->buf[sb->len - 1] != c)
+		strbuf_addch(sb, c);
+}
+
 char *strlpart(char *txt, int maxlen)
 {
 	char *result;