diff --git a/lib/AST/CMakeLists.txt b/lib/AST/CMakeLists.txt
index 2f1a6af..3408a1e 100644
--- a/lib/AST/CMakeLists.txt
+++ b/lib/AST/CMakeLists.txt
@@ -11,6 +11,7 @@
   Decl.cpp
   DeclBase.cpp
   DeclCXX.cpp
+  DeclFriend.cpp
   DeclGroup.cpp
   DeclObjC.cpp
   DeclPrinter.cpp