diff --git a/cglib.spec b/cglib.spec
index 9799772..d48c191 100644
--- a/cglib.spec
+++ b/cglib.spec
@@ -4,7 +4,7 @@
 
 Name:           cglib
 Version:        3.3.0
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Code Generation Library for Java
 # ASM MethodVisitor is based on ASM code and therefore
 # BSD-licensed. Everything else is ASL 2.0.
@@ -69,7 +69,7 @@ Documentation for the cglib code generation library.
 %build
 # 5 tests fail with OpenJDK 11
 # Forwarded upstream: https://github.com/cglib/cglib/issues/119
-%mvn_build -f
+%mvn_build -f -- -Djava.version.source=1.7 -Djava.version.target=1.7
 
 %install
 %mvn_install
@@ -81,6 +81,9 @@ Documentation for the cglib code generation library.
 %license LICENSE NOTICE
 
 %changelog
+* Tue Nov 02 2021 Mikolaj Izdebski <mizdebsk@redhat.com> - 3.3.0-5
+- Set explicit Java compiler source/target levels to 1.7
+
 * Wed Jul 21 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3.3.0-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild