diff --git a/run-command.h b/run-command.h
index 07bed6c31b..5bd0c933e8 100644
--- a/run-command.h
+++ b/run-command.h
@@ -142,7 +142,6 @@ struct child_process {
 	unsigned clean_on_exit:1;
 	unsigned wait_after_clean:1;
 	void (*clean_on_exit_handler)(struct child_process *process);
-	void *clean_on_exit_handler_cbdata;
 };
 
 #define CHILD_PROCESS_INIT { \