diff --git a/jpgpj.spec b/jpgpj.spec
index 310d6c2..77c226a 100644
--- a/jpgpj.spec
+++ b/jpgpj.spec
@@ -47,12 +47,17 @@ API documentation for %{name}
 
 %prep
 %autosetup
+
 cp %{SOURCE1} pom.xml
 
 %{mvn_file} : %{name}
 
 %build
-%{mvn_build} -f -- -Dmaven.compiler.release=8
+%{mvn_build} -f -- \
+%if %{?pkg_vcmp:%pkg_vcmp java-devel >= 9}%{!?pkg_vcmp:0}
+    -Dmaven.compiler.release=8 \
+%endif
+    -Dsource=8
 
 %install
 %mvn_install