diff --git a/libavcodec/dxva2_h264.c b/libavcodec/dxva2_h264.c
index a4278c80b5258cad573cb6eeb82524ef4b51376a..5b23b28f1202b8ad790fdfe1b539738f8d016f5f 100644
--- a/libavcodec/dxva2_h264.c
+++ b/libavcodec/dxva2_h264.c
@@ -22,16 +22,12 @@
 
 #include "libavutil/avassert.h"
 
+#include "dxva2_internal.h"
 #include "h264dec.h"
 #include "h264data.h"
 #include "h264_ps.h"
 #include "mpegutils.h"
 
-// The headers above may include w32threads.h, which uses the original
-// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
-// potentially newer version.
-#include "dxva2_internal.h"
-
 struct dxva2_picture_context {
     DXVA_PicParams_H264   pp;
     DXVA_Qmatrix_H264     qm;
diff --git a/libavcodec/dxva2_hevc.c b/libavcodec/dxva2_hevc.c
index 0ae07d304f1b9aed3595e3f833ecddd5b6e15dcf..dbb701fb1c3fc4bfbb36bdf2e5ce10418bbaf3a8 100644
--- a/libavcodec/dxva2_hevc.c
+++ b/libavcodec/dxva2_hevc.c
@@ -22,14 +22,10 @@
 
 #include "libavutil/avassert.h"
 
+#include "dxva2_internal.h"
 #include "hevc_data.h"
 #include "hevcdec.h"
 
-// The headers above may include w32threads.h, which uses the original
-// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
-// potentially newer version.
-#include "dxva2_internal.h"
-
 #define MAX_SLICES 256
 
 struct hevc_dxva2_picture_context {
diff --git a/libavcodec/dxva2_mpeg2.c b/libavcodec/dxva2_mpeg2.c
index a57778b4271dd0e34f33b8c4ede2e48eda678595..8cc21bf19957d66d543aec9f9f266e9908581c91 100644
--- a/libavcodec/dxva2_mpeg2.c
+++ b/libavcodec/dxva2_mpeg2.c
@@ -21,13 +21,10 @@
  */
 
 #include "libavutil/log.h"
-#include "mpegutils.h"
-#include "mpegvideo.h"
 
-// The headers above may include w32threads.h, which uses the original
-// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
-// potentially newer version.
 #include "dxva2_internal.h"
+#include "mpegutils.h"
+#include "mpegvideo.h"
 
 #define MAX_SLICES 1024
 struct dxva2_picture_context {
diff --git a/libavcodec/dxva2_vc1.c b/libavcodec/dxva2_vc1.c
index 06f1083b3afd1ff617379e806077074107753d1c..f08ac8b5a0d7c0d91dca252fad0c7a5379e63914 100644
--- a/libavcodec/dxva2_vc1.c
+++ b/libavcodec/dxva2_vc1.c
@@ -20,16 +20,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "dxva2_internal.h"
 #include "mpegutils.h"
 #include "vc1.h"
 #include "vc1data.h"
 
-// The headers above may include w32threads.h, which uses the original
-// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
-// potentially newer version.
-#include "dxva2_internal.h"
-
 #define MAX_SLICES 1024
+
 struct dxva2_picture_context {
     DXVA_PictureParameters pp;
     unsigned               slice_count;
diff --git a/libavcodec/dxva2_vp9.c b/libavcodec/dxva2_vp9.c
index 5a5b226422808470d21fc6d94e5c01bd9f4ac634..eaeab3af7af2389b871ffe8a2adb5badf2a94ef5 100644
--- a/libavcodec/dxva2_vp9.c
+++ b/libavcodec/dxva2_vp9.c
@@ -23,12 +23,8 @@
 #include "libavutil/avassert.h"
 #include "libavutil/pixdesc.h"
 
-#include "vp9shared.h"
-
-// The headers above may include w32threads.h, which uses the original
-// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
-// potentially newer version.
 #include "dxva2_internal.h"
+#include "vp9shared.h"
 
 struct vp9_dxva2_picture_context {
     DXVA_PicParams_VP9    pp;
diff --git a/libavutil/hwcontext_d3d11va.c b/libavutil/hwcontext_d3d11va.c
index d39fdd3fc85a913d9fc4962639588a5681c94da7..b68d26280442cea63bedf324fd55d4052566248a 100644
--- a/libavutil/hwcontext_d3d11va.c
+++ b/libavutil/hwcontext_d3d11va.c
@@ -20,14 +20,6 @@
 
 #include <windows.h>
 
-// Include thread.h before redefining _WIN32_WINNT, to get
-// the right implementation for AVOnce
-#include "thread.h"
-
-#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600
-#endif
 #define COBJMACROS
 
 #include <initguid.h>
@@ -46,6 +38,7 @@
 #include "imgutils.h"
 #include "pixdesc.h"
 #include "pixfmt.h"
+#include "thread.h"
 
 typedef HRESULT(WINAPI *PFN_CREATE_DXGI_FACTORY)(REFIID riid, void **ppFactory);
 
diff --git a/libavutil/hwcontext_dxva2.c b/libavutil/hwcontext_dxva2.c
index 665c2d6d746ad7a38dd28560f43b66be5685b102..4585f323bb61d2df27c9030ba56ee9201a44d3ce 100644
--- a/libavutil/hwcontext_dxva2.c
+++ b/libavutil/hwcontext_dxva2.c
@@ -18,10 +18,6 @@
 
 #include <windows.h>
 
-#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600
-#endif
 #define DXVA2API_USE_BITFIELDS
 #define COBJMACROS