diff --git a/wsutil/CMakeLists.txt b/wsutil/CMakeLists.txt
index eb319c4520..c6090e6701 100644
--- a/wsutil/CMakeLists.txt
+++ b/wsutil/CMakeLists.txt
@@ -68,6 +68,8 @@ set(WSUTIL_FILES
 	type_util.c
 	u3.c
 	unicode-utils.c
+	ws_mempbrk.c
+	ws_mempbrk_sse42.c
 	nghttp2/nghttp2_buf.c
 	nghttp2/nghttp2_hd.c
 	nghttp2/nghttp2_hd_huffman.c