1 files changed, 1 insertions, 1 deletions
diff --git a/src/mark.c b/src/mark.c
index 33333de..9a34f62 100644
--- a/src/mark.c
+++ b/src/mark.c
@@ -45,7 +45,7 @@
  * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  */
 
-static int  is_letter __P((int));
+static int  is_letter __P((char));
 static void nextword __P((int *, int *, int, int));
 static int  linestart __P((int));
 static int  lineend __P((int));