diff --git a/test_drs110m.pl b/test_drs110m.pl
index 163df69..c755586 100755
--- a/test_drs110m.pl
+++ b/test_drs110m.pl
@@ -6,14 +6,13 @@ use strict;
 use warnings;
 
 use Path::Tiny;
-use Cwd qw(getcwd);
 use IO::Socket::INET;
 
-my $workdir = getcwd;
+BEGIN {
+    push @INC, "./lib";
+}
 
-push @INC, "$workdir/lib";
-
-require iec1107;
+use iec1107;
 
 my $port = Device::SerialPort->new(
     "/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AK072UA9-if00-port0")