diff --git a/mozilla/config/make-jars.pl b/mozilla/config/make-jars.pl
index 6f2c695174b..8e06557a352 100644
--- a/mozilla/config/make-jars.pl
+++ b/mozilla/config/make-jars.pl
@@ -58,7 +58,7 @@ if (defined($::opt_l)) {
 if ($verbose) {
     print "make-jars "
         . "-v -d $chromeDir "
-        . ($fileformat ? "-f $fileformat" : "")
+        . ($fileformat ? "-f $fileformat " : "")
         . ($nofilelocks ? "-l " : "")
         . ($baseFilesDir ? "-s $baseFilesDir " : "")
         . "\n";