diff --git a/src/pipewire/stream.h b/src/pipewire/stream.h
index ca52a132b..a220c3721 100644
--- a/src/pipewire/stream.h
+++ b/src/pipewire/stream.h
@@ -201,7 +201,7 @@ struct pw_stream_events {
 				enum pw_stream_state state, const char *error);
 
 	/** Notify information about a control.  */
-	void (*control_info) (void *data, uint32_t id, struct pw_stream_control *control);
+	void (*control_info) (void *data, uint32_t id, const struct pw_stream_control *control);
 
 	/** when the format changed. The listener should call
 	 * pw_stream_finish_format() from within this callback or later to complete
diff --git a/src/tests/test-stream.c b/src/tests/test-stream.c
index f5192f06f..443965b7f 100644
--- a/src/tests/test-stream.c
+++ b/src/tests/test-stream.c
@@ -40,7 +40,7 @@ static void test_abi(void)
 		void (*destroy) (void *data);
 		void (*state_changed) (void *data, enum pw_stream_state old,
 			enum pw_stream_state state, const char *error);
-	        void (*control_info) (void *data, uint32_t id, struct pw_stream_control *control);
+	        void (*control_info) (void *data, uint32_t id, const struct pw_stream_control *control);
 		void (*format_changed) (void *data, const struct spa_pod *format);
 		void (*add_buffer) (void *data, struct pw_buffer *buffer);
 		void (*remove_buffer) (void *data, struct pw_buffer *buffer);