diff --git a/src/charset.c b/src/charset.c
index 37d08f249c7..499782011a2 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -819,7 +819,7 @@ TO-CODE, which are CHARSET code points.  */)
     from = CHARSET_MIN_CODE (cs);
   else
     {
-      CHECK_FIXNAT(from_code);
+      CHECK_FIXNAT (from_code);
       from = XFIXNUM (from_code);
       if (from < CHARSET_MIN_CODE (cs))
 	from = CHARSET_MIN_CODE (cs);
@@ -828,7 +828,7 @@ TO-CODE, which are CHARSET code points.  */)
     to = CHARSET_MAX_CODE (cs);
   else
     {
-      CHECK_FIXNAT(to_code);
+      CHECK_FIXNAT (to_code);
       to = XFIXNUM (to_code);
       if (to > CHARSET_MAX_CODE (cs))
 	to = CHARSET_MAX_CODE (cs);