diff --git a/lasso/id-ff/provider.h b/lasso/id-ff/provider.h
index 58a10252..1da17591 100644
--- a/lasso/id-ff/provider.h
+++ b/lasso/id-ff/provider.h
@@ -275,6 +275,9 @@ LASSO_EXPORT lasso_error_t lasso_provider_set_server_signing_key(LassoProvider *
 
 LASSO_EXPORT lasso_error_t lasso_provider_add_key(LassoProvider *provider, LassoKey *key, gboolean after);
 
+LASSO_EXPORT int lasso_provider_verify_signature(LassoProvider *provider,
+		const char *message, const char *id_attr_name, LassoMessageFormat format);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/lasso/id-ff/providerprivate.h b/lasso/id-ff/providerprivate.h
index cc2eb39b..1f03b3ce 100644
--- a/lasso/id-ff/providerprivate.h
+++ b/lasso/id-ff/providerprivate.h
@@ -86,8 +86,6 @@ struct _LassoProviderPrivate
 
 gboolean lasso_provider_load_metadata(LassoProvider *provider, const gchar *metadata);
 gboolean lasso_provider_load_metadata_from_buffer(LassoProvider *provider, const gchar *metadata);
-int lasso_provider_verify_signature(LassoProvider *provider,
-		const char *message, const char *id_attr_name, LassoMessageFormat format);
 gboolean lasso_provider_load_public_key(LassoProvider *provider,
 		LassoPublicKeyType public_key_type);
 GList* lasso_provider_get_public_keys(const LassoProvider *provider);