diff --git a/configure.ac b/configure.ac
index 6151e88..821f842 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,7 @@ m4_foreach_w([_m], [
     File::Basename
     File::Path
     Getopt::Long
+    IO::Socket::INET
     Socket
     Sys::Hostname
     version=0.77
diff --git a/ddclient.in b/ddclient.in
index 1cec317..aab4212 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -25,6 +25,7 @@ use warnings;
 use File::Basename;
 use File::Path qw(make_path);
 use Getopt::Long;
+use IO::Socket::INET;
 use Socket qw(AF_INET AF_INET6 PF_INET PF_INET6);
 use Sys::Hostname;