diff --git a/java_cup.spec b/java_cup.spec
index 67bfbca..c8d8970 100644
--- a/java_cup.spec
+++ b/java_cup.spec
@@ -44,6 +44,8 @@ Documentation for java_cup.
 %setup -q
 %patch0 -b .build
 
+sed -i '/<javac/s/1.5/1.6/g' build.xml
+
 # remove all binary files
 find -name "*.class" -delete