1 files changed, 1 insertions, 1 deletions

diff --git a/src/data.c b/src/data.c
index 95d29ac9e98..1526cc0c737 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1837,7 +1837,7 @@ notify_variable_watchers (Lisp_Object symbol,
 {
   symbol = Findirect_variable (symbol);
 
-  ptrdiff_t count = SPECPDL_INDEX ();
+  specpdl_ref count = SPECPDL_INDEX ();
   record_unwind_protect (restore_symbol_trapped_write, symbol);
   /* Avoid recursion.  */
   set_symbol_trapped_write (symbol, SYMBOL_UNTRAPPED_WRITE);