diff --git a/gsk/gskgldriver.c b/gsk/gskgldriver.c
index 41c6f6ca82..dbc3977527 100644
--- a/gsk/gskgldriver.c
+++ b/gsk/gskgldriver.c
@@ -45,10 +45,10 @@ struct _GskGLDriver
   GHashTable *textures;
   GHashTable *vaos;
 
-  Texture *bound_source_texture;
-  Texture *bound_mask_texture;
-  Vao *bound_vao;
-  Fbo *bound_fbo;
+  const Texture *bound_source_texture;
+  const Texture *bound_mask_texture;
+  const Vao *bound_vao;
+  const Fbo *bound_fbo;
 
   int max_texture_size;