diff --git a/sisu-mojos.spec b/sisu-mojos.spec
index cac7fe7..350cb03 100644
--- a/sisu-mojos.spec
+++ b/sisu-mojos.spec
@@ -2,7 +2,7 @@
 
 Name:           sisu-mojos
 Version:        0.3.4
-Release:        8%{?dist}
+Release:        9%{?dist}
 Summary:        Sisu plugin for Apache Maven
 License:        EPL-1.0
 URL:            http://www.eclipse.org/sisu
@@ -48,7 +48,7 @@ mv releases/%{version}/* .
 %mvn_alias : org.sonatype.plugins:
 
 %build
-%mvn_build
+%mvn_build -- -Dmaven.compiler.source=1.7 -Dmaven.compiler.target=1.7
 
 %install
 %mvn_install
@@ -60,6 +60,9 @@ mv releases/%{version}/* .
 %doc LICENSE.txt
 
 %changelog
+* Tue Nov 02 2021 Mikolaj Izdebski <mizdebsk@redhat.com> - 0.3.4-9
+- Set explicit Java compiler source/target levels to 1.7
+
 * Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.4-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild