diff --git a/configure b/configure
index 3ca37502b6e..58dbf88d7e5 100755
--- a/configure
+++ b/configure
@@ -17462,6 +17462,69 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+fi
+echo "$as_me:$LINENO: checking for socklen_t" >&5
+echo $ECHO_N "checking for socklen_t... $ECHO_C" >&6
+if test "${ac_cv_type_socklen_t+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+int
+main ()
+{
+if ((socklen_t *) 0)
+  return 0;
+if (sizeof (socklen_t))
+  return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_type_socklen_t=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_type_socklen_t=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: $ac_cv_type_socklen_t" >&5
+echo "${ECHO_T}$ac_cv_type_socklen_t" >&6
+if test $ac_cv_type_socklen_t = yes; then
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_SOCKLEN_T 1
+_ACEOF
+
+
 fi
 echo "$as_me:$LINENO: checking for long long" >&5
 echo $ECHO_N "checking for long long... $ECHO_C" >&6
diff --git a/configure.ac b/configure.ac
index ea52dee2031..71467ab70ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1264,7 +1264,7 @@ dnl **** Check for types ****
 
 AC_C_CONST
 AC_C_INLINE
-AC_CHECK_TYPES([mode_t, off_t, pid_t, size_t, ssize_t, long long, fsblkcnt_t, fsfilcnt_t])
+AC_CHECK_TYPES([mode_t, off_t, pid_t, size_t, ssize_t, socklen_t, long long, fsblkcnt_t, fsfilcnt_t])
 
 AC_CACHE_CHECK([whether linux/input.h is for real],
 	wine_cv_linux_input_h,
diff --git a/dlls/wininet/cookie.c b/dlls/wininet/cookie.c
index 11f7867ca9b..217ef1b4c0b 100644
--- a/dlls/wininet/cookie.c
+++ b/dlls/wininet/cookie.c
@@ -21,6 +21,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 #include <stdio.h>
diff --git a/dlls/wininet/dialogs.c b/dlls/wininet/dialogs.c
index 9187ed8f3df..abfcc569c72 100644
--- a/dlls/wininet/dialogs.c
+++ b/dlls/wininet/dialogs.c
@@ -19,6 +19,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 
diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 19a6ed1de9a..859f13c00b2 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -26,6 +26,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <sys/types.h>
 #ifdef HAVE_SYS_SOCKET_H
diff --git a/dlls/wininet/urlcache.c b/dlls/wininet/urlcache.c
index b153ed66a1f..2a110507116 100644
--- a/dlls/wininet/urlcache.c
+++ b/dlls/wininet/urlcache.c
@@ -24,6 +24,7 @@
 
 #define COM_NO_WINDOWS_H
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 #include <stdio.h>
diff --git a/dlls/wininet/utility.c b/dlls/wininet/utility.c
index e6415868744..e2f56c7adb3 100644
--- a/dlls/wininet/utility.c
+++ b/dlls/wininet/utility.c
@@ -23,6 +23,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 #include <stdlib.h>
diff --git a/include/config.h.in b/include/config.h.in
index a48aef5e565..56339e4f229 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -524,6 +524,9 @@
 /* Define to 1 if you have the <socket.h> header file. */
 #undef HAVE_SOCKET_H
 
+/* Define to 1 if the system has the type `socklen_t'. */
+#undef HAVE_SOCKLEN_T
+
 /* Define to 1 if you have the <soundcard.h> header file. */
 #undef HAVE_SOUNDCARD_H
 
diff --git a/include/wine/port.h b/include/wine/port.h
index b4b1a26c440..73288de614f 100644
--- a/include/wine/port.h
+++ b/include/wine/port.h
@@ -61,6 +61,9 @@ typedef int pid_t;
 #ifndef HAVE_SIZE_T
 typedef unsigned int size_t;
 #endif
+#ifndef HAVE_SOCKLEN_T
+typedef unsigned int socklen_t;
+#endif
 #ifndef HAVE_SSIZE_T
 typedef int ssize_t;
 #endif