diff --git a/maven-plugin-plugin/src/it/mplugin-319_report-since/invoker.properties b/maven-plugin-plugin/src/it/mplugin-319_report-since/invoker.properties
index 1f02de5..40c7ac6 100644
--- a/maven-plugin-plugin/src/it/mplugin-319_report-since/invoker.properties
+++ b/maven-plugin-plugin/src/it/mplugin-319_report-since/invoker.properties
@@ -16,3 +16,4 @@
 # under the License.
 
 invoker.goals = clean plugin:report
+invoker.mavenOpts = -Duser.language=en -Duser.country=US -Duser.variant=US