diff --git a/src/glx/x11/single2.c b/src/glx/x11/single2.c
index b008c6996c1..83a25052220 100644
--- a/src/glx/x11/single2.c
+++ b/src/glx/x11/single2.c
@@ -40,6 +40,7 @@
 #ifdef USE_XCB
 #include <xcb/xcb.h>
 #include <xcb/glx.h>
+#include <X11/Xlib-xcb.h>
 #endif /* USE_XCB */