diff --git a/manifests/init.pp b/manifests/init.pp
index 095ea64..44baeaa 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -35,7 +35,7 @@
   validate_hash($resources)
 
   if $backend { validate_re($backend, ['^etcd$', '^consul$', '^zookeeper$', '^dynamodb$', '^redis$', '^env$']) }
-  if $interval { validate_re($interval, '^\d+') }
+  if $interval { validate_re("$interval", '^\d+') }
   if $confdnoop { validate_bool($confdnoop) }
   if $log_level { validate_re($log_level, ['^debug$', '^info$', '^warn(ing)?$', '^error$', '^fatal$', '^panic$']) }
   if $nodes { validate_array($nodes) }
diff --git a/manifests/resource.pp b/manifests/resource.pp
index ff1b2fe..d4d7649 100644
--- a/manifests/resource.pp
+++ b/manifests/resource.pp
@@ -28,7 +28,7 @@
   if $reload_cmd { validate_string($reload_cmd) }
   if $check_cmd { validate_string($check_cmd) }
   if $prefix { validate_string($prefix) }
-  if $mode { validate_re($mode, '^\d+')}
+  if $mode { validate_re("$mode", '^\d+')}
 
   $resourcefile = "${confd::confdir}/conf.d/${name}.toml"