diff --git a/src/modules/module-client-node/client-stream.c b/src/modules/module-client-node/client-stream.c
index 0aebab922..293ee9056 100644
--- a/src/modules/module-client-node/client-stream.c
+++ b/src/modules/module-client-node/client-stream.c
@@ -1146,7 +1146,7 @@ static void client_node_active_changed(void *data, bool active)
 	impl->active = active;
 }
 
-static void client_node_info_changed (void *data, struct pw_node_info *info)
+static void client_node_info_changed (void *data, const struct pw_node_info *info)
 {
 	struct impl *impl = data;
 	struct pw_client_stream *this = &impl->this;
diff --git a/src/pipewire/client.h b/src/pipewire/client.h
index 4ef37aab0..689703b79 100644
--- a/src/pipewire/client.h
+++ b/src/pipewire/client.h
@@ -98,7 +98,7 @@ struct pw_client_events {
 	void (*free) (void *data);
 
 	/** emited when the client info changed */
-	void (*info_changed) (void *data, struct pw_client_info *info);
+	void (*info_changed) (void *data, const struct pw_client_info *info);
 
 	/** emited when a new resource is added for client */
 	void (*resource_added) (void *data, struct pw_resource *resource);
@@ -135,7 +135,7 @@ void pw_client_destroy(struct pw_client *client);
 
 /** Finish configuration and register a client */
 int pw_client_register(struct pw_client *client,	/**< the client to register */
-		       struct pw_client *owner,	/**< optional owner */
+		       struct pw_client *owner,		/**< optional owner */
 		       struct pw_global *parent,	/**< the client parent */
 		       struct pw_properties *properties/**< extra properties */);
 
diff --git a/src/pipewire/core.h b/src/pipewire/core.h
index cfae245f7..43a00c78e 100644
--- a/src/pipewire/core.h
+++ b/src/pipewire/core.h
@@ -88,7 +88,7 @@ struct pw_core_events {
 	/** The core is being freed */
 	void (*free) (void *data);
 	/** The core info changed,  use \ref pw_core_get_info() to get the updated info */
-	void (*info_changed) (void *data, struct pw_core_info *info);
+	void (*info_changed) (void *data, const struct pw_core_info *info);
 	/** a new client object is added */
 	void (*check_access) (void *data, struct pw_client *client);
 	/** a new global object was added */
diff --git a/src/pipewire/device.h b/src/pipewire/device.h
index 2af1f1dc2..969ca4a26 100644
--- a/src/pipewire/device.h
+++ b/src/pipewire/device.h
@@ -58,7 +58,7 @@ struct pw_device_events {
         void (*destroy) (void *data);
 
 	/** the device info changed */
-	void (*info_changed) (void *data, struct pw_device_info *info);
+	void (*info_changed) (void *data, const struct pw_device_info *info);
 };
 
 struct pw_device *pw_device_new(struct pw_core *core,
diff --git a/src/pipewire/node.h b/src/pipewire/node.h
index 6d98a9865..bc772b796 100644
--- a/src/pipewire/node.h
+++ b/src/pipewire/node.h
@@ -69,7 +69,7 @@ struct pw_node_events {
         void (*port_removed) (void *data, struct pw_port *port);
 
 	/** the node info changed */
-	void (*info_changed) (void *data, struct pw_node_info *info);
+	void (*info_changed) (void *data, const struct pw_node_info *info);
 	/** the node active state changed */
 	void (*active_changed) (void *data, bool active);
 	/** the node enabled state changed */
diff --git a/src/pipewire/port.h b/src/pipewire/port.h
index b2886c7bb..5bbb5b529 100644
--- a/src/pipewire/port.h
+++ b/src/pipewire/port.h
@@ -70,7 +70,7 @@ struct pw_port_events {
 	void (*free) (void *data);
 
 	/** the port info changed */
-	void (*info_changed) (void *data, struct pw_port_info *info);
+	void (*info_changed) (void *data, const struct pw_port_info *info);
 
 	/** a new link is added on this port */
 	void (*link_added) (void *data, struct pw_link *link);
diff --git a/src/pipewire/remote.c b/src/pipewire/remote.c
index d42995d9b..fc4e28749 100644
--- a/src/pipewire/remote.c
+++ b/src/pipewire/remote.c
@@ -1329,7 +1329,7 @@ static void node_destroy(void *data)
 	spa_hook_remove(&d->proxy_listener);
 }
 
-static void node_info_changed(void *data, struct pw_node_info *info)
+static void node_info_changed(void *data, const struct pw_node_info *info)
 {
 	struct node_data *d = data;
 	uint32_t change_mask = 0;