diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d8a6d45f..b09a847a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -244,12 +244,12 @@ if(BUILD_X11)
 endif(BUILD_X11)
 
 if(BUILD_GUI)
-  set(gui fonts.cc fonts.h gui.cc gui.h)
+  set(gui fonts.cc fonts.h gui.cc gui.h x11-color.cc x11-color.h)
   set(optional_sources ${optional_sources} ${gui})
 endif(BUILD_GUI)
 
 if(BUILD_WAYLAND)
-  set(wl_srcs wl.cc wl.h xdg-shell-protocol.c wlr-layer-shell-protocol.c x11-color.cc x11-color.h)
+  set(wl_srcs wl.cc wl.h xdg-shell-protocol.c wlr-layer-shell-protocol.c)
   set(optional_sources ${optional_sources} ${wl_srcs})
   # generate protocol implementations
   set(XDG_PROT_DEF "${Wayland_PROTOCOLS_DIR}/stable/xdg-shell/xdg-shell.xml")
diff --git a/src/colours.cc b/src/colours.cc
index a77d6d70..8f3011c1 100644
--- a/src/colours.cc
+++ b/src/colours.cc
@@ -32,9 +32,9 @@
 #ifdef BUILD_X11
 #include "x11.h"
 #endif /*BUILD_X11*/
-#ifdef BUILD_WAYLAND
+#ifdef BUILD_GUI
 #include "x11-color.h"
-#endif /*BUILD_WAYLAND*/
+#endif /*BUILD_GUI*/
 #ifdef BUILD_NCURSES
 #include <ncurses.h>
 #endif /*BUILD_NCURSES*/