diff --git a/texk/web2c/cwebdir/ctwill-w2c.ch b/texk/web2c/cwebdir/ctwill-w2c.ch
index 12b5f771f2..52a199f563 100644
--- a/texk/web2c/cwebdir/ctwill-w2c.ch
+++ b/texk/web2c/cwebdir/ctwill-w2c.ch
@@ -1555,8 +1555,8 @@ new_meaning(
     name_pointer p=id_lookup(first,loc-1,normal);
     sixteen_bits t=title_lookup();
     if (*(loc-1)=='}')
-      while (xisdigit(*loc))@^system dependencies@>
-        if (n < INT_MAX / 10) n=10*n+(*loc++)-'0';
+      for (;xisdigit(*loc);loc++)@^system dependencies@>
+        if (n < INT_MAX / 10) n=10*n+(*loc)-'0';
     if (*loc++!=' ')
       err_print(_("! Location in meaning should be followed by space"));
     else @<Digest the meaning of |p|, |t|, |n|@>@;
diff --git a/texk/web2c/cwebdir/cweave.w b/texk/web2c/cwebdir/cweave.w
index 0f20e0699c..4cd934c1e1 100644
--- a/texk/web2c/cwebdir/cweave.w
+++ b/texk/web2c/cwebdir/cweave.w
@@ -4241,8 +4241,8 @@ else {
     loc++;
   }
   else {
-    sec_depth=0; while (xisdigit(*loc))@^system dependencies@>
-      if (sec_depth < INT_MAX / 10) sec_depth = sec_depth*10 + (*loc++) -'0';
+    for (sec_depth=0; xisdigit(*loc);loc++)@^system dependencies@>
+      if (sec_depth < INT_MAX / 10) sec_depth = sec_depth*10 + (*loc) -'0';
   }
   while (*loc == ' ') loc++; /* remove spaces before group title */
   group_found=true;