diff --git a/jsr-305-ri-build.xml b/jsr-305-ri-build.xml
index b85c475..92267d0 100644
--- a/jsr-305-ri-build.xml
+++ b/jsr-305-ri-build.xml
@@ -2,7 +2,7 @@
 	<target name="build" depends="clean,classes,jar,javadoc"/>
 	<target name="classes">
 		<mkdir dir="src/main/java"/>
-		<javac  destdir="src/main/java" source="1.5" debug="on">
+		<javac  destdir="src/main/java" debug="on">
 			<src path="src/main/java"/>
 			<classpath>
 				<pathelement location="src/main/java"/>
diff --git a/jsr-305.changes b/jsr-305.changes
index ffa9fec..5387a30 100644
--- a/jsr-305.changes
+++ b/jsr-305.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Sep 19 09:49:18 UTC 2017 - fstrba@suse.com
+
+- Fix build with jdk9: specify java target and source 1.6
+
 -------------------------------------------------------------------
 Fri May 19 10:53:24 UTC 2017 - dziolkowski@suse.com
 
diff --git a/jsr-305.spec b/jsr-305.spec
index e29f9f1..bdc33fb 100644
--- a/jsr-305.spec
+++ b/jsr-305.spec
@@ -32,6 +32,7 @@ Source1:        jsr-305-ri-build.xml
 # The URL reffers to New BSD License - used <OWNER> == Bill Pugh, <YEAR> == 2008
 Source2:        license
 BuildRequires:  ant
+BuildRequires:  fdupes
 BuildRequires:  java-devel
 BuildRequires:  javapackages-local
 BuildRequires:  javapackages-tools
@@ -64,7 +65,7 @@ cp %{SOURCE2} .
 export OPT_JAR_LIST=:
 export CLASSPATH=
 pushd ri
-%{ant} -Dant.build.javac.source=1.5 -Dant.build.javac.target=1.5 \
+%{ant} -Dant.build.javac.source=1.6 -Dant.build.javac.target=1.6 \
        -Dversion=%{version} -Djava.javadoc=%{_javadocdir}/java
 popd
 
@@ -82,6 +83,7 @@ cp -a ri/pom.xml %{buildroot}%{_mavenpomdir}/JPP-%{name}.pom
 # javadoc
 mkdir -p %{buildroot}%{_javadocdir}/%{name}
 cp -a ri/javadoc/* %{buildroot}%{_javadocdir}/%{name}
+%fdupes -s %{buildroot}%{_javadocdir}/%{name}
 
 %files
 %defattr(0644,root,root,0755)