diff --git a/qdox.changes b/qdox.changes
index 53c0540..48b2164 100644
--- a/qdox.changes
+++ b/qdox.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Apr  5 06:12:32 UTC 2018 - fstrba@suse.com
+
+- Build with java source and target version 6 in order to produce
+  bytecode understood by all supported java versions
+
 -------------------------------------------------------------------
 Fri Jun  9 10:30:22 UTC 2017 - tchvatal@suse.com
 
diff --git a/qdox.spec b/qdox.spec
index 31b5f84..fc7ac53 100644
--- a/qdox.spec
+++ b/qdox.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package qdox
 #
-# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -101,7 +101,7 @@ pushd target
 popd
 mv target/Parser.java src/java/com/thoughtworks/qdox/parser/impl
 rm -f src/java/com/thoughtworks/qdox/junit/APITestCase.java
-ant -Dbuild.sysclasspath=only jar
+ant -Dant.build.javac.source=6 -Dant.build.javac.target=6 -Dbuild.sysclasspath=only jar
 
 %install
 # jars