diff --git a/plugins-parent/project.properties b/plugins-parent/project.properties
index 98a29d5a..46c23be6 100644
--- a/plugins-parent/project.properties
+++ b/plugins-parent/project.properties
@@ -138,6 +138,7 @@ maven.scm.checkout.dir=${maven.build.dir}/scm/checkout
 #=====
 # Fork so that plugins unit tests are run with the correct classpath
 maven.junit.fork = true
+maven.junit.forkmode = once
 
 #=====
 # XDOC plugin settings