diff --git a/generator/c.ml b/generator/c.ml
index f05da03b8..205b0236f 100644
--- a/generator/c.ml
+++ b/generator/c.ml
@@ -1228,7 +1228,7 @@ and generate_client_actions hash () =
   (* Generate code for enter events. *)
   let enter_event shortname =
     pr "  guestfs_int_call_callbacks_message (g, GUESTFS_EVENT_ENTER,\n";
-    pr "                                    \"%s\", %d);\n"
+    pr "                                      \"%s\", %d);\n"
       shortname (String.length shortname)
   in