diff --git a/tox.ini b/tox.ini
index 5b41c1d..20c843d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ deps =
 [testenv:build]
 basepython = python3
 commands =
-    charm-build --log-level DEBUG -o {toxinidir}/build src {posargs}
+    charm-build --log-level DEBUG --wheelhouse-overrides wheelhouse-overrides.txt -o {toxinidir}/build src {posargs}
 
 [testenv:py3]
 basepython = python3
diff --git a/wheelhouse-overrides.txt b/wheelhouse-overrides.txt
new file mode 100644
index 0000000..59fdfca
--- /dev/null
+++ b/wheelhouse-overrides.txt
@@ -0,0 +1 @@
+git+https://github.com/juju/charm-helpers.git#egg=charmhelpers