diff --git a/Shorewall-core/configure.pl b/Shorewall-core/configure.pl
index a21b4d7de..f83afa03c 100755
--- a/Shorewall-core/configure.pl
+++ b/Shorewall-core/configure.pl
@@ -170,7 +170,7 @@ for ( qw/ HOST
 	  AUXINITSOURCE
 	  AUXINITFILE
 	  SERVICEDIR
-          SERVICEFILE
+	  SERVICEFILE
 	  SYSCONFFILE
 	  SYSCONFDIR
 	  SPARSE