diff --git a/puppet-manifests/tox.ini b/puppet-manifests/tox.ini
index 3e8227b74f..19e4a409e2 100644
--- a/puppet-manifests/tox.ini
+++ b/puppet-manifests/tox.ini
@@ -28,6 +28,6 @@ skip_tests = \
     --no-autoloader_layout-check \
     --no-documentation-check
 commands =
-    gem install --no-document puppet-lint
+    gem install --no-document json puppet-lint
     bash -c "find {toxinidir} -name \*.pp -print0 | xargs -0 puppet-lint --fail-on-warnings {[testenv:puppetlint]skip_tests}"
 
diff --git a/puppet-modules-wrs/tox.ini b/puppet-modules-wrs/tox.ini
index 488b79702a..8e0bfa7488 100644
--- a/puppet-modules-wrs/tox.ini
+++ b/puppet-modules-wrs/tox.ini
@@ -27,6 +27,6 @@ setenv =
 skip_tests = \
     --no-documentation-check
 commands =
-    gem install --no-document puppet-lint
+    gem install --no-document json puppet-lint
     bash -c "find {toxinidir} -name \*.pp -print0 | xargs -0 puppet-lint --fail-on-warnings {[testenv:puppetlint]skip_tests}"