1 files changed, 1 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 175dcab2487..ae32400708a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3201,7 +3201,7 @@ cleanup_vector (struct Lisp_Vector *vector)
       && ((vector->header.size & PSEUDOVECTOR_SIZE_MASK)
           == FONT_OBJECT_MAX))
     {
-      struct font_driver *drv = ((struct font *) vector)->driver;
+      struct font_driver const *drv = ((struct font *) vector)->driver;
 
       /* The font driver might sometimes be NULL, e.g. if Emacs was
          interrupted before it had time to set it up.  */