diff --git a/lib/webfuse/provider/impl/provider.h b/lib/webfuse/provider/impl/provider.h
index a9b814d..1e8ec1f 100644
--- a/lib/webfuse/provider/impl/provider.h
+++ b/lib/webfuse/provider/impl/provider.h
@@ -30,7 +30,7 @@ struct wfp_provider
 
 struct wfp_impl_invokation_context
 {
-    struct wfp_provider * provider;
+    struct wfp_provider const * provider;
     void * user_data;
     struct wfp_request * request;
 };