diff --git a/wmakerlib/src/defaults.rs b/wmakerlib/src/defaults.rs
new file mode 100644
index 00000000..1a3e31f4
--- /dev/null
+++ b/wmakerlib/src/defaults.rs
@@ -0,0 +1,13 @@
+pub mod ffi {
+    use std::ffi::{c_char, c_int};
+
+    unsafe extern "C" {
+        pub fn wDefaultFillAttributes(
+            instance: *const c_char,
+            class: *const c_char,
+            attr: *mut crate::window::WindowAttributes,
+            mask: *mut crate::window::WindowAttributes,
+            use_global_default: c_int,
+        );
+    }
+}
diff --git a/wmakerlib/src/lib.rs b/wmakerlib/src/lib.rs
index 7d21b01a..0aa47138 100644
--- a/wmakerlib/src/lib.rs
+++ b/wmakerlib/src/lib.rs
@@ -1,6 +1,7 @@
 pub mod application;
 pub mod app_icon;
 pub mod app_menu;
+pub mod defaults;
 pub mod icon;
 pub mod screen;
 pub mod window;