diff --git a/testsite/playbooks/roles/wsgihello2/files/requirements.in b/testsite/playbooks/roles/wsgihello2/files/requirements.in
index 50e81ced2918547e2b4a687115e84a9fa79657af..84f2ad26f8500131ad788130035369644ba73df0 100644
--- a/testsite/playbooks/roles/wsgihello2/files/requirements.in
+++ b/testsite/playbooks/roles/wsgihello2/files/requirements.in
@@ -1,3 +1,5 @@
 django-apptemplates
 ipcalc
 django~=1.8.0
+# Undeclared dependency in ipcalc 1.99.0 (fixed in master HEAD).
+six
\ No newline at end of file