diff --git a/manifests/expirer.pp b/manifests/expirer.pp
index 597b09cb..07a16fb7 100644
--- a/manifests/expirer.pp
+++ b/manifests/expirer.pp
@@ -61,7 +61,7 @@ class ceilometer::expirer (
 
   cron { 'ceilometer-expirer':
     command     => $ceilometer::params::expirer_command,
-    environment => 'PATH=/bin:/usr/bin:/usr/sbin',
+    environment => 'PATH=/bin:/usr/bin:/usr/sbin SHELL=/bin/sh',
     user        => 'ceilometer',
     minute      => $minute,
     hour        => $hour,
diff --git a/spec/classes/ceilometer_expirer_spec.rb b/spec/classes/ceilometer_expirer_spec.rb
index 08d62fd3..945c9f12 100644
--- a/spec/classes/ceilometer_expirer_spec.rb
+++ b/spec/classes/ceilometer_expirer_spec.rb
@@ -44,7 +44,7 @@ describe 'ceilometer::expirer' do
     it 'configures a cron' do
       should contain_cron('ceilometer-expirer').with(
         :command     => 'ceilometer-expirer',
-        :environment => 'PATH=/bin:/usr/bin:/usr/sbin',
+        :environment => 'PATH=/bin:/usr/bin:/usr/sbin SHELL=/bin/sh',
         :user        => 'ceilometer',
         :minute      => 1,
         :hour        => 0,