diff --git a/app/core/gimp-utils.c b/app/core/gimp-utils.c
index a1c563e7e8..7ac01babd5 100644
--- a/app/core/gimp-utils.c
+++ b/app/core/gimp-utils.c
@@ -33,9 +33,7 @@
 #include <glib.h>
 
 #ifdef G_OS_WIN32
-#define _WIN32_WINNT 0x0500
 #include <windows.h>
-#include <process.h>
 #endif
 
 #include <cairo.h>
diff --git a/app/main.c b/app/main.c
index 510e6b90d9..1adc133cb2 100644
--- a/app/main.c
+++ b/app/main.c
@@ -74,13 +74,6 @@
 #include "unique.h"
 
 #ifdef G_OS_WIN32
-/* To get PROCESS_DEP_* defined we need _WIN32_WINNT at 0x0601. We still
- * use the API optionally only if present, though.
- */
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0601
 #include <windows.h>
 #include <conio.h>
 #endif
diff --git a/app/tests/gimp-app-test-utils.c b/app/tests/gimp-app-test-utils.c
index dbf0436148..4ab44eac43 100644
--- a/app/tests/gimp-app-test-utils.c
+++ b/app/tests/gimp-app-test-utils.c
@@ -40,16 +40,6 @@
 
 #include "gimp-app-test-utils.h"
 
-#ifdef G_OS_WIN32
-/* SendInput() requirement is Windows 2000 pro or over.
- * We may need to set WINVER to make sure the compiler does not try to
- * compile for on older version of win32, thus breaking the build.
- * See
- * http://msdn.microsoft.com/en-us/library/aa383745%28v=vs.85%29.aspx#setting_winver_or__win32_winnt
- */
-#define WINVER 0x0500
-#include <windows.h>
-#endif /* G_OS_WIN32 */
 
 #ifdef GDK_WINDOWING_QUARTZ
 // only to get keycode definitions from HIToolbox/Events.h
diff --git a/libgimp/gimp-debug.c b/libgimp/gimp-debug.c
index 34b7a101f5..b6f69cd37b 100644
--- a/libgimp/gimp-debug.c
+++ b/libgimp/gimp-debug.c
@@ -43,11 +43,6 @@
 #  endif
 #  define STRICT
 
-#  ifdef _WIN32_WINNT
-#  undef _WIN32_WINNT
-#  endif
-#  define _WIN32_WINNT 0x0601
-
 #  include <windows.h>
 #  include <tlhelp32.h>
 #  include <processthreadsapi.h>
diff --git a/libgimp/gimp-shm.c b/libgimp/gimp-shm.c
index 1cd6e9430c..6de8d71f18 100644
--- a/libgimp/gimp-shm.c
+++ b/libgimp/gimp-shm.c
@@ -51,11 +51,6 @@
 #  endif
 #  define STRICT
 
-#  ifdef _WIN32_WINNT
-#  undef _WIN32_WINNT
-#  endif
-#  define _WIN32_WINNT 0x0601
-
 #  include <windows.h>
 #  include <tlhelp32.h>
 #  undef RGB
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index 4734896538..1e18689a87 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -75,11 +75,6 @@
 #  endif
 #  define STRICT
 
-#  ifdef _WIN32_WINNT
-#  undef _WIN32_WINNT
-#  endif
-#  define _WIN32_WINNT 0x0601
-
 #  include <windows.h>
 #  include <tlhelp32.h>
 #  undef RGB
diff --git a/libgimpwidgets/gimpwidgetsutils.c b/libgimpwidgets/gimpwidgetsutils.c
index 9bd073f8af..bc32d8079d 100644
--- a/libgimpwidgets/gimpwidgetsutils.c
+++ b/libgimpwidgets/gimpwidgetsutils.c
@@ -37,10 +37,6 @@
 #endif
 
 #ifdef G_OS_WIN32
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0600
 #include <windows.h>
 #include <icm.h>
 #endif
diff --git a/modules/controller-dx-dinput.c b/modules/controller-dx-dinput.c
index afb6c27c16..60ade55d0a 100644
--- a/modules/controller-dx-dinput.c
+++ b/modules/controller-dx-dinput.c
@@ -33,9 +33,7 @@
 #include <string.h>
 #include <math.h>
 
-#define _WIN32_WINNT 0x0501
 #include <windows.h>
-#define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>
 
 #include <gegl.h>
diff --git a/modules/gimpinputdevicestore-dx.c b/modules/gimpinputdevicestore-dx.c
index 7e7e210fab..5a99d92419 100644
--- a/modules/gimpinputdevicestore-dx.c
+++ b/modules/gimpinputdevicestore-dx.c
@@ -27,9 +27,7 @@
 #include <gtk/gtk.h>
 
 #ifdef HAVE_DX_DINPUT
-#define _WIN32_WINNT 0x0501
 #include <windows.h>
-#define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>
 #include <rpc.h>
 
diff --git a/plug-ins/screenshot/screenshot-win32.c b/plug-ins/screenshot/screenshot-win32.c
index 47882def66..7e296bc714 100644
--- a/plug-ins/screenshot/screenshot-win32.c
+++ b/plug-ins/screenshot/screenshot-win32.c
@@ -31,14 +31,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-/* Necessary in order to have SetProcessDPIAware() defined.
- * This value of _WIN32_WINNT corresponds to Windows 7, which is our
- * minimum supported platform.
- */
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0601
 #include <windows.h>
 
 #include <libgimp/gimp.h>
diff --git a/plug-ins/script-fu/server/script-fu-server.c b/plug-ins/script-fu/server/script-fu-server.c
index c4761842f1..7bf9ed64cb 100644
--- a/plug-ins/script-fu/server/script-fu-server.c
+++ b/plug-ins/script-fu/server/script-fu-server.c
@@ -61,21 +61,11 @@
 #include <glib.h>
 
 #ifdef G_OS_WIN32
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0502
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
 typedef short sa_family_t; /* Not defined by winsock */
 
-#ifndef AI_ADDRCONFIG
-/* Missing from mingw headers, but value is publicly documented
- * on http://msdn.microsoft.com/en-us/library/ms737530%28v=VS.85%29.aspx
- */
-#define AI_ADDRCONFIG 0x0400
-#endif
 #include <libgimpbase/gimpwin32-io.h>
 #else
 #include <sys/socket.h>
diff --git a/tools/gimp-debug-resume.c b/tools/gimp-debug-resume.c
index 2aac3b3d49..75a9453bd6 100644
--- a/tools/gimp-debug-resume.c
+++ b/tools/gimp-debug-resume.c
@@ -2,7 +2,6 @@
  */
 
 #define WIN32_LEAN_AND_MEAN
-#define _WIN32_WINNT 0x0502
 #include <windows.h>
 #include <tchar.h>
 #include <tlhelp32.h>