diff --git a/srclibs/FrenchRevolutionaryCalendar.txt b/srclibs/FrenchRevolutionaryCalendar.txt
index 8ef0941492..2cda80b57e 100644
--- a/srclibs/FrenchRevolutionaryCalendar.txt
+++ b/srclibs/FrenchRevolutionaryCalendar.txt
@@ -1,2 +1,3 @@
 Repo Type:git
 Repo:https://github.com/caarmen/french-revolutionary-calendar
+Prepare:sed -i -e "/<properties>/a<maven.compiler.source>1.7</maven.compiler.source>\n<maven.compiler.target>1.7</maven.compiler.target>" pom.xml library/pom.xml