diff --git a/build-support/factor.sh b/build-support/factor.sh
index 52a989b78d..8045a5fe7e 100755
--- a/build-support/factor.sh
+++ b/build-support/factor.sh
@@ -551,7 +551,7 @@ install_build_system_port() {
 }
 
 usage() {
-    $ECHO "usage: $0 install|install-x11|install-macosx|self-update|quick-update|update|bootstrap|dlls|net-bootstrap|make-target|report [optional-target]"
+    $ECHO "usage: $0 install|install-x11|install-macosx|self-update|quick-update|update|bootstrap|net-bootstrap|make-target|report [optional-target]"
     $ECHO "If you are behind a firewall, invoke as:"
     $ECHO "env GIT_PROTOCOL=http $0 <command>"
     $ECHO ""