diff --git a/src/modules/module-protocol-native/protocol-native.c b/src/modules/module-protocol-native/protocol-native.c
index 49b291561..77d1c6e74 100644
--- a/src/modules/module-protocol-native/protocol-native.c
+++ b/src/modules/module-protocol-native/protocol-native.c
@@ -1089,7 +1089,7 @@ static int client_demarshal_info(void *object, void *data, size_t size)
 }
 
 static void client_marshal_permissions(void *object, uint32_t index, uint32_t n_permissions,
-		struct pw_permission *permissions)
+		const struct pw_permission *permissions)
 {
 	struct pw_resource *resource = object;
 	struct spa_pod_builder *b;
diff --git a/src/pipewire/interfaces.h b/src/pipewire/interfaces.h
index 9b2079506..f44002f31 100644
--- a/src/pipewire/interfaces.h
+++ b/src/pipewire/interfaces.h
@@ -838,7 +838,7 @@ struct pw_client_proxy_events {
 	void (*permissions) (void *object,
 			     uint32_t index,
 			     uint32_t n_permissions,
-			     struct pw_permission *permissions);
+			     const struct pw_permission *permissions);
 };
 
 /** Client */