1 files changed, 1 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 5eafa21c2c7..4a276a4cc12 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4892,6 +4892,7 @@ mark_kboards ()
       mark_object (&kb->Vsystem_key_alist);
       mark_object (&kb->system_key_syms);
       mark_object (&kb->Vdefault_minibuffer_frame);
+      mark_object (&kb->echo_string);
     }
 }