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-rw-r--r--src/alloc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/alloc.c b/src/alloc.c
index 1019c2af6cc..f15b978d52d 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -6348,6 +6348,7 @@ mark_object (Lisp_Object arg)
break;
case PVEC_SUBR:
+ mark_object (XSUBR (obj)->doc);
break;
case PVEC_FREE: