diff --git a/ChangeLog b/ChangeLog
index 1f09904d..e8674fb6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2001-08-03  Akim Demaille  <akim@epita.fr>
+
+	* configure.in: Try using -Wformat when compiling.
+
 2001-08-03  Akim Demaille  <akim@epita.fr>
 
 	* configure.in: Bump to 1.28b.
diff --git a/configure.in b/configure.in
index 7ac00733..5fa45f09 100644
--- a/configure.in
+++ b/configure.in
@@ -34,6 +34,7 @@ if test "${enableval}" = yes; then
   BISON_WARNING(-Wbad-function-cast)
   BISON_WARNING(-Wcast-align)
   BISON_WARNING(-Wcast-qual)
+  BISON_WARNING(-Wformat)
   BISON_WARNING(-Wmissing-declarations)
   BISON_WARNING(-Wmissing-prototypes)
   BISON_WARNING(-Wnested-externs)