diff --git a/check_smstools/bin/check_smstools b/check_smstools/bin/check_smstools
index a7a0336..707d289 100755
--- a/check_smstools/bin/check_smstools
+++ b/check_smstools/bin/check_smstools
@@ -13,9 +13,31 @@
 
 use strict;
 use warnings;
-use Nagios::Plugin;
 use POSIX;
 
+sub load_module {
+    my @names = @_;
+    my $module;
+    for my $name (@names) {
+        my $file = $name;
+        # requires need either a bare word or a file name
+        $file =~ s{::}{/}gsxm;
+        $file .= '.pm';
+        eval {
+            require $file;
+            $name->import();
+            $module = $name;
+		};
+		last if $module;
+    }
+    return $module;
+}
+
+my $plugin_module;
+BEGIN {
+	$plugin_module = load_module( 'Monitoring::Plugin', 'Nagios::Plugin' );
+}
+
 # Define regular expressions used to find the correct lines from
 # the status file
 my $signal_command = 'AT\+CSQ';
@@ -45,7 +67,7 @@ my $timestamp;
 my $np;
 
 sub init_plugin {
-	$np = Nagios::Plugin->new(usage => "usage: %s");
+	$np = $plugin_module->new(usage => "usage: %s");
 
 	$np->add_arg(
 		spec => 'warning|w=f',