diff --git a/signpost-core.spec b/signpost-core.spec
index e630b0b..0633797 100644
--- a/signpost-core.spec
+++ b/signpost-core.spec
@@ -82,7 +82,7 @@ sed -i 's/\r//' LICENSE
 %{mvn_file} :signpost-commonshttp4 signpost-commonshttp4
 
 %build
-%{mvn_build} -s -f -- -Dsource=6
+%{mvn_build} -s -f -- -Dmaven.compiler.release=6
 
 %install
 %mvn_install