diff --git a/scripts/placement.pl b/scripts/placement.pl
index 77544c5..d29414d 100644
--- a/scripts/placement.pl
+++ b/scripts/placement.pl
@@ -15,6 +15,7 @@
   next unless(-f $cell);
   my $lib=$mag; $lib=~s/\.mag$/.lib/;
   next unless(-f $lib);
+  next unless(-f $ENV{'CARAVEL'}."/cells/mag/$name.mag");
 
   my $name=""; $name=$1 if($mag=~m/([\w\-\.]+)\.mag$/);
   print "$name ".($width*80)." $nextla N\n";