diff --git a/vncviewer/CMakeLists.txt b/vncviewer/CMakeLists.txt
index 56313e9..3c18646 100644
--- a/vncviewer/CMakeLists.txt
+++ b/vncviewer/CMakeLists.txt
@@ -29,7 +29,9 @@
 if(WIN32)
   set(VNCVIEWER_SOURCES ${VNCVIEWER_SOURCES} win32.c)
 elseif(APPLE)
-  set(VNCVIEWER_SOURCES ${VNCVIEWER_SOURCES} cocoa.mm)
+  set(VNCVIEWER_SOURCES ${VNCVIEWER_SOURCES} cocoa.mm osx_to_qnum.c)
+else()
+  set(VNCVIEWER_SOURCES ${VNCVIEWER_SOURCES} xkb_to_qnum.c)
 endif()
 
 if(WIN32)