diff --git a/src/sources/CMakeLists.txt b/src/sources/CMakeLists.txt
index 25b0953..1912e0f 100644
--- a/src/sources/CMakeLists.txt
+++ b/src/sources/CMakeLists.txt
@@ -4,6 +4,9 @@ set(SOURCES "")
 add_library("f2b_source_files" MODULE "files.c" "../strlcpy.c")
 list(APPEND SOURCES "f2b_source_files")
 
+add_library("f2b_source_portknock" MODULE "portknock.c" "../strlcpy.c")
+list(APPEND SOURCES "f2b_source_portknock")
+
 find_library(REDIS_FOUND "hiredis")
 if (WITH_REDIS AND REDIS_FOUND)
   add_library("f2b_source_redis" MODULE "redis.c" "../strlcpy.c")