diff --git a/Makefile.PL b/Makefile.PL
index 164e2ac..dbb105b 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -26,6 +26,7 @@ WriteMakefile(
     'PL_FILES'         => {},
     'LICENSE'          => 'perl',
     'PREREQ_PM' => {
+        'Crypt::OpenSSL::Bignum' => 0,
         'Crypt::OpenSSL::Random' => 0,
     },
     'TEST_REQUIRES' => {
@@ -46,9 +47,6 @@ WriteMakefile(
                 version => MM->parse_version('RSA.pm'),
             },
         },
-        recommends => {
-            'Crypt::OpenSSL::Bignum' => 0,
-        },
         configure_requires => {
             'Crypt::OpenSSL::Guess' => '0.11',
         },
diff --git a/RSA.pm b/RSA.pm
index 50d3c0e..f2abf98 100644
--- a/RSA.pm
+++ b/RSA.pm
@@ -4,6 +4,7 @@ use strict;
 use warnings;
 
 use Carp;    # Removing carp will break the XS code.
+use Crypt::OpenSSL::Bignum;
 
 our $VERSION = '0.37';
 
diff --git a/t/sig_die.t b/t/sig_die.t
deleted file mode 100644
index 0e7d427..0000000
--- a/t/sig_die.t
+++ /dev/null
@@ -1,13 +0,0 @@
-use strict;
-use Test::More;
-
-use lib 't/fakelib';
-
-my $handler_called;
-$SIG{__DIE__} = sub { ++$handler_called };
-
-require Crypt::OpenSSL::RSA;
-
-plan tests => 1;
-
-ok !$handler_called, 'outer $SIG{__DIE__} handler not called';