diff --git a/cogl/cogl-internal.h b/cogl/cogl-internal.h
index a920a9785..714b75d19 100644
--- a/cogl/cogl-internal.h
+++ b/cogl/cogl-internal.h
@@ -109,8 +109,6 @@ _cogl_get_texture_unit (int index_);
 void
 _cogl_destroy_texture_units (void);
 
-void    _cogl_flush_matrix_stacks (void);
-
 void
 _cogl_flush_face_winding (void);