diff --git a/src/main/java/hudson/plugins/jacoco/portlet/grid/JacocoBuilderGrid.java b/src/main/java/hudson/plugins/jacoco/portlet/grid/JacocoBuilderGrid.java
index dae4d68e..3901c748 100644
--- a/src/main/java/hudson/plugins/jacoco/portlet/grid/JacocoBuilderGrid.java
+++ b/src/main/java/hudson/plugins/jacoco/portlet/grid/JacocoBuilderGrid.java
@@ -76,7 +76,7 @@ public JacocoCoverageResultSummary getJaCoCoCoverageResultSummary(Collection<Job
   /**
    * Descriptor that will be shown on Dashboard Portlets view.
    */
-  @Extension
+  @Extension(optional = true)
   public static class JacocoGridDescriptor extends Descriptor<DashboardPortlet> {
 
     @Override