diff --git a/lib/securerandom.rb b/lib/securerandom.rb
index 6079fdb..0548a06 100644
--- a/lib/securerandom.rb
+++ b/lib/securerandom.rb
@@ -85,7 +85,7 @@ def gen_random_urandom(n)
     rescue RuntimeError
       begin
         require 'openssl'
-      rescue NoMethodError
+      rescue LoadError
         raise NotImplementedError, "No random device"
       else
         alias gen_random gen_random_openssl