diff --git a/lib/gala.deps.in b/lib/gala.deps.in
index d16b847b..f893b1c9 100644
--- a/lib/gala.deps.in
+++ b/lib/gala.deps.in
@@ -1,4 +1,5 @@
 gdk-pixbuf-2.0
 glib-2.0
 gobject-2.0
+posix
 @MUTTER_DEP@