1 files changed, 1 insertions, 1 deletions

diff --git a/src/eval.c b/src/eval.c
index e3e7d8e26b2..c2cd6c60ea4 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1226,7 +1226,7 @@ internal_lisp_condition_case (Lisp_Object var, Lisp_Object bodyform,
                               Lisp_Object handlers)
 {
   struct handler *oldhandlerlist = handlerlist;
-  ptrdiff_t clausenb = 0;
+  volatile ptrdiff_t clausenb = 0;
 
   CHECK_SYMBOL (var);