diff --git a/Makefile.PL b/Makefile.PL
index 0a0caa9..4015e9c 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -38,10 +38,12 @@ WriteMakefile(
                 recommends => {
                     'Crypt::OpenSSL::Bignum' => 0,
                 },
-                build_requires => {
-                    'Test'                  => 0,    # For testing
+                configure_requires => {
                     'Crypt::OpenSSL::Guess' => 0,
                 },
+                build_requires => {
+                    'Test' => 0,    # For testing
+                },
                 resources => {
                     'license'    => 'http://dev.perl.org/licenses/',
                     'homepage'   => 'http://github.com/toddr/Crypt-OpenSSL-RSA',