diff --git a/build/bakefiles/files.bkl b/build/bakefiles/files.bkl
index f1491625f2..9ccfd002c2 100644
--- a/build/bakefiles/files.bkl
+++ b/build/bakefiles/files.bkl
@@ -1647,7 +1647,7 @@
     src/cocoa/data.cpp
     src/cocoa/dc.mm
     src/cocoa/dcclient.mm
-    src/cocoa/dcmemory.cpp
+    src/cocoa/dcmemory.mm
     src/cocoa/dcscreen.cpp
     src/cocoa/dialog.mm
     src/cocoa/font.cpp