diff --git a/antlr3.spec b/antlr3.spec
index ef10eac..fdad4c1 100644
--- a/antlr3.spec
+++ b/antlr3.spec
@@ -196,7 +196,8 @@ popd
 # build ant task
 pushd antlr-ant/main/antlr3-task/
 export CLASSPATH=$(build-classpath ant)
-javac -encoding ISO-8859-1 antlr3-src/org/apache/tools/ant/antlr/ANTLR3.java
+javac -encoding ISO-8859-1 -source 1.8 -target 1.8 \
+  antlr3-src/org/apache/tools/ant/antlr/ANTLR3.java
 jar cvf ant-antlr3.jar \
   -C antlr3-src org/apache/tools/ant/antlr/antlib.xml \
   -C antlr3-src org/apache/tools/ant/antlr/ANTLR3.class