diff --git a/CMakeLists.txt b/CMakeLists.txt
index 721f17ee6..2660709a1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -393,7 +393,8 @@ set(SOURCES
 	lib/parsers.c
 	lib/context.c
 	lib/alloc.c
-	lib/header.c)
+	lib/header.c
+	lib/file-callbacks.c)
 
 if (NOT LWS_WITHOUT_CLIENT)
 	list(APPEND SOURCES