diff --git a/mozilla/build/unix/uniq.pl b/mozilla/build/unix/uniq.pl
index 66132884de2..1aafafad1a5 100755
--- a/mozilla/build/unix/uniq.pl
+++ b/mozilla/build/unix/uniq.pl
@@ -22,6 +22,6 @@
 
 undef @out;
 foreach $d (@ARGV) { 
-    push @out, $d if (!grep(/$d/, @out));
+    push @out, $d if (!grep(/^$d$/, @out));
 }
 print "@out\n"