diff --git a/configure.ac b/configure.ac
index b4c2f77..48616e1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,9 @@ AC_SUBST([PERL])
 m4_foreach_w([_m], [
     File::Basename
     File::Path
+    Getopt::Long
+    Socket
+    Sys::Hostname
     version=0.77
   ], [AX_PROG_PERL_MODULES([_m], [],
          [AC_MSG_ERROR([missing required Perl module _m])])])
diff --git a/ddclient.in b/ddclient.in
index 0389ebc..776cb21 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -25,8 +25,8 @@ use warnings;
 use File::Basename;
 use File::Path qw(make_path);
 use Getopt::Long;
+use Socket qw(AF_INET AF_INET6 PF_INET PF_INET6);
 use Sys::Hostname;
-use IO::Socket;
 
 use version 0.77; our $VERSION = version->declare('v3.9.1');
 (my $version = $VERSION->stringify()) =~ s/^v//;