diff --git a/configure b/configure
index 0cc9f61..71c3fa8 100755
--- a/configure
+++ b/configure
@@ -4864,7 +4864,7 @@ fi
 
 
 
-for ac_header in os2.h fcntl.h unistd.h libc.h sys/time.h sys/types.h
+for ac_header in os2.h fcntl.h unistd.h libc.h sys/time.h sys/types.h sys/socket.h
 do
 as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
diff --git a/include/sane/config.h.in b/include/sane/config.h.in
index baf35be..b8d901d 100644
--- a/include/sane/config.h.in
+++ b/include/sane/config.h.in
@@ -108,6 +108,9 @@
 /* Define to 1 if you have the `strtod' function. */
 #undef HAVE_STRTOD
 
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#undef HAVE_SYS_SOCKET_H
+
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H