diff --git a/manifests/system.pp b/manifests/system.pp
index e064206d..25083895 100644
--- a/manifests/system.pp
+++ b/manifests/system.pp
@@ -13,17 +13,6 @@
     default   => $version,
   }
 
-  # curl needs to be installed
-  if ! defined(Package['curl']) {
-    case $facts['kernel'] {
-      'Linux': {
-        ensure_packages(['curl'])
-        Package['curl'] -> Exec['system-rvm']
-      }
-      default: {}
-    }
-  }
-
   $http_proxy_environment = $proxy_url ? {
     undef   => [],
     default => ["http_proxy=${proxy_url}", "https_proxy=${proxy_url}"]
@@ -74,11 +63,14 @@
     }
   }
   else {
+    ensure_packages(['curl'])
+
     exec { 'system-rvm':
       path        => '/usr/bin:/usr/sbin:/bin:/usr/local/bin',
       command     => "curl -fsSL https://get.rvm.io | bash -s -- --version ${actual_version}",
       creates     => '/usr/local/rvm/bin/rvm',
       environment => $environment,
+      require     => Package['curl'],
     }
   }