1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc.c b/src/doc.c
index 09f377bb1af..39cffee19cb 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -445,7 +445,7 @@ store_function_docstring (fun, offset)
         {
           tem = Fcdr (Fcdr (fun));
           if (CONSP (tem) && INTEGERP (XCAR (tem)))
-            XSETFASTINT (XCAR (tem), offset);
+            XSETCARFASTINT (tem, offset);
         }
       else if (EQ (tem, Qmacro))
         store_function_docstring (XCDR (fun), offset);