diff --git a/README.md b/README.md
index 2afbbb2..5740aa0 100644
--- a/README.md
+++ b/README.md
@@ -247,7 +247,7 @@ perl version.
 
 ##### `timeout`
 
-`String` Defaults to `900`
+`Integer` Defaults to `900`
 
 This sets the timeout on the `perlbrew install` command.  It may be nessicary
 to increase this value on a slow host or if the `--notest` flag is not being
diff --git a/manifests/perl.pp b/manifests/perl.pp
index b5e7e5a..c93216c 100644
--- a/manifests/perl.pp
+++ b/manifests/perl.pp
@@ -9,7 +9,7 @@
   validate_string($target)
   validate_string($version)
   validate_string($flags)
-  validate_string($timeout)
+  validate_integer($timeout)
 
   Perlbrew[$target] -> Perlbrew::Perl[$name]