diff --git a/Shorewall/compiler b/Shorewall/compiler
index 6f53e40ff..60cb5fde6 100755
--- a/Shorewall/compiler
+++ b/Shorewall/compiler
@@ -794,7 +794,7 @@ match_source_dev()
 {
     if [ -n "$BRIDGING" ]; then
 	known_port $1 && physdev_echo "--physdev-in $1" || echo -i $1
-    elif known_interface $1 then
+    elif known_interface $1; then
 	echo -i $1
     elif [ -n "$PHYSDEV_MATCH" ]; then
 	physdev_echo "--physdev-in $1"
@@ -807,7 +807,7 @@ match_dest_dev()
 {
     if [ -n "$BRIDGING" ]; then
 	known_port $1 && physdev_echo "--physdev-out $1" || echo -o $1
-    elif known_interface $1 then
+    elif known_interface $1; then
 	echo -o $1
     elif [ -n "$PHYSDEV_MATCH" ]; then
 	physdev_echo "--physdev-out $1"