diff --git a/apache-commons-collections.spec b/apache-commons-collections.spec
index be408b4..349f1eb 100644
--- a/apache-commons-collections.spec
+++ b/apache-commons-collections.spec
@@ -59,7 +59,7 @@ sed -i 's/\r//' LICENSE.txt PROPOSAL.html README.txt NOTICE.txt
 %mvn_file ':commons-collections{,-testframework}' %{name}@1 commons-collections@1
 
 %build
-%mvn_build
+%mvn_build -- -Dmaven.compiler.source=1.6 -Dmaven.compiler.target=1.6
 
 %install
 %mvn_artifact commons-collections:commons-collections-testframework:%{version} target/commons-collections-testframework-%{version}.jar