1 files changed, 1 insertions, 1 deletions

diff --git a/src/xfont.c b/src/xfont.c
index 2c3ca911623..8b1e37aa146 100644
--- a/src/xfont.c
+++ b/src/xfont.c
@@ -248,7 +248,7 @@ xfont_chars_supported (Lisp_Object chars, XFontStruct *xfont,
     }
   else if (VECTORP (chars))
     {
-      int i;
+      ptrdiff_t i;
 
       for (i = ASIZE (chars) - 1; i >= 0; i--)
         {