diff --git a/jetty-minimal.spec b/jetty-minimal.spec
index ce0c8f5..0a3797a 100644
--- a/jetty-minimal.spec
+++ b/jetty-minimal.spec
@@ -438,7 +438,7 @@ sed -i '/<SystemProperty name="jetty.state"/d' \
 %if %{?pkg_vcmp:%pkg_vcmp java-devel >= 9}%{!?pkg_vcmp:0}
     -Dmaven.compiler.release=8 \
 %endif
-    -Dsource=8
+    -Dsource=8 -T 1
 
 %install
 %mvn_install