diff --git a/00-set-javac-1.8-source-target.patch b/00-set-javac-1.8-source-target.patch
new file mode 100644
index 0000000..15c18a7
--- /dev/null
+++ b/00-set-javac-1.8-source-target.patch
@@ -0,0 +1,20 @@
+diff --git a/build.xml b/build.xml
+index 2c22915..0e2f669 100644
+--- a/build.xml
++++ b/build.xml
+@@ -10,13 +10,13 @@
+   </target>
+ 
+   <target name="compile" depends="init">
+-    <javac destdir="build/classes" debug="true" source="1.5" target="1.5" deprecation="true" encoding="UTF-8">
++    <javac destdir="build/classes" debug="true" source="1.8" target="1.8" deprecation="true" encoding="UTF-8">
+        <src path="src"/>
+     </javac>
+   </target>
+ 
+   <target name="compile-tests" depends="compile">
+-    <javac destdir="build/test-classes" debug="true" source="1.5" target="1.5" deprecation="true" encoding="UTF-8">
++    <javac destdir="build/test-classes" debug="true" source="1.8" target="1.8" deprecation="true" encoding="UTF-8">
+        <classpath>
+          <pathelement location="build/classes"/>
+        </classpath>
diff --git a/bytelist.spec b/bytelist.spec
index 1159a58..303a562 100644
--- a/bytelist.spec
+++ b/bytelist.spec
@@ -6,13 +6,15 @@
 
 Name:           bytelist
 Version:        1.0.8
-Release:        20%{?dist}
+Release:        21%{?dist}
 Summary:        A java library for lists of bytes
 
 License:        CPL or GPLv2+ or LGPLv2+
 URL:            http://github.com/%{cluster}/%{name}
 Source0:        http://download.github.com/%{cluster}-%{name}-%{version}-0-g%{git_commit}.tar.gz
 
+Patch0:         00-set-javac-1.8-source-target.patch
+
 BuildArch:      noarch
 
 BuildRequires:  ant
@@ -34,6 +36,7 @@ A small java library for manipulating lists of bytes.
 
 %prep
 %setup -q -n %{cluster}-%{name}-%{git_commit}
+%patch0 -p1
 
 find -name '*.class' -delete
 find -name '*.jar' -delete
@@ -67,6 +70,9 @@ export CLASSPATH=$(build-classpath junit jcodings)
 %doc README.txt
 
 %changelog
+* Sun Jul 19 2020 Fabio Valentini <decathorpe@gmail.com> - 1.0.8-21
+- Set javac source and target to 1.8 to fix Java 11 builds.
+
 * Fri Jul 10 2020 Jiri Vanek <jvanek@redhat.com> - 1.0.8-20
 - Rebuilt for JDK-11, see https://fedoraproject.org/wiki/Changes/Java11