diff --git a/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
index 7a88d7c90..160709508 100644
--- a/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
@@ -30,7 +30,7 @@
 
 
 extern "C" {
-  int os_create_anonymous_file(off_t); // in libdecor
+#  include "../../../libdecor/src/os-compatibility.h" // for os_create_anonymous_file()
 }