diff --git a/bsf.spec b/bsf.spec
index 1980fc4..5e153ec 100644
--- a/bsf.spec
+++ b/bsf.spec
@@ -1,6 +1,6 @@
 Name:           bsf
 Version:        2.4.0
-Release:        47%{?dist}
+Release:        48%{?dist}
 Summary:        Bean Scripting Framework
 License:        ASL 2.0
 URL:            http://commons.apache.org/bsf/
@@ -56,7 +56,7 @@ find -name \*.jar -delete
 
 %build
 export CLASSPATH=$(build-classpath apache-commons-logging xalan-j2)
-ant -Dsource.level=1.6 jar
+ant -Dsource.level=1.6 -Dant.build.javac.target=1.6 jar
 
 %mvn_artifact %{SOURCE1} build/lib/%{name}.jar
 
@@ -68,6 +68,9 @@ ant -Dsource.level=1.6 jar
 %doc AUTHORS.txt CHANGES.txt README.txt TODO.txt RELEASE-NOTE.txt
 
 %changelog
+* Wed Dec 04 2024 Mikolaj Izdebski <mizdebsk@redhat.com> - 2.4.0-48
+- Explicitly specify JVM target version
+
 * Sat Nov 23 2024 Marián Konček <mkoncek@redhat.com> - 2.4.0-47
 - Add noarch to ExclusiveArch