diff --git a/manifests/resource/location.pp b/manifests/resource/location.pp
index 353e5b192..72724271d 100644
--- a/manifests/resource/location.pp
+++ b/manifests/resource/location.pp
@@ -199,7 +199,9 @@
   if ($proxy != undef) {
     validate_string($proxy)
   }
-  validate_string($proxy_redirect)
+  if ($proxy_redirect != undef) {
+    validate_string($proxy_redirect)
+  }
   validate_string($proxy_read_timeout)
   validate_string($proxy_connect_timeout)
   validate_array($proxy_set_header)
diff --git a/manifests/resource/vhost.pp b/manifests/resource/vhost.pp
index 1214aacf1..ba607f3c5 100644
--- a/manifests/resource/vhost.pp
+++ b/manifests/resource/vhost.pp
@@ -287,7 +287,9 @@
     validate_string($proxy)
   }
   validate_string($proxy_read_timeout)
-  validate_string($proxy_redirect)
+  if ($proxy_redirect != undef) {
+    validate_string($proxy_redirect)
+  }
   validate_array($proxy_set_header)
   if ($proxy_cache != false) {
     validate_string($proxy_cache)