diff --git a/webapp/config/jarlist/known_dependencies.txt b/webapp/config/jarlist/known_dependencies.txt
index 87000a9e5..1db0d99de 100644
--- a/webapp/config/jarlist/known_dependencies.txt
+++ b/webapp/config/jarlist/known_dependencies.txt
@@ -21,4 +21,7 @@ commons-logging-1.1.1.jar
 #    n3Delete.jsp
 #    processDatapropRdfForm.jsp
 #    processRdfForm2.jsp
-xstream-1.2.2.jar
\ No newline at end of file
+xstream-1.2.2.jar
+
+# Used in error.jsp, which should probably go away.
+cos.jar