diff --git a/.appveyor.yml b/.appveyor.yml
index 0f5dea9c5..4c5a7f9ee 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -14,7 +14,7 @@ environment:
     ARCHITECTURE: x86
     APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
   - PYTHON: C:/Python38-x64
-    ARCHITECTURE: x64
+    ARCHITECTURE: AMD64
     APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
 
 
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 85d9eba1c..36e98aa55 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -81,18 +81,15 @@ jobs:
           path: ./wheelhouse/*.whl
 
   windows:
-    name: Windows ${{ matrix.arch }}
+    name: Windows ${{ matrix.cibw_arch }}
     runs-on: windows-latest
     strategy:
       fail-fast: false
       matrix:
         include:
-          - arch: x86
-            cibw_arch: x86
-          - arch: x64
-            cibw_arch: AMD64
-          - arch: ARM64
-            cibw_arch: ARM64
+          - cibw_arch: x86
+          - cibw_arch: AMD64
+          - cibw_arch: ARM64
     steps:
       - uses: actions/checkout@v4
 
@@ -116,7 +113,7 @@ jobs:
 
           & python.exe -m pip install -r .ci/requirements-cibw.txt
 
-          & python.exe winbuild\build_prepare.py -v --no-imagequant --architecture=${{ matrix.arch }}
+          & python.exe winbuild\build_prepare.py -v --no-imagequant --architecture=${{ matrix.cibw_arch }}
         shell: pwsh
 
       - name: Build wheels
@@ -157,13 +154,13 @@ jobs:
       - name: Upload wheels
         uses: actions/upload-artifact@v4
         with:
-          name: dist-windows-${{ matrix.arch }}
+          name: dist-windows-${{ matrix.cibw_arch }}
           path: ./wheelhouse/*.whl
 
       - name: Upload fribidi.dll
         uses: actions/upload-artifact@v4
         with:
-          name: fribidi-windows-${{ matrix.arch }}
+          name: fribidi-windows-${{ matrix.cibw_arch }}
           path: winbuild\build\bin\fribidi*
 
   sdist:
diff --git a/winbuild/build.rst b/winbuild/build.rst
index a8e4ebaa6..cd3b559e7 100644
--- a/winbuild/build.rst
+++ b/winbuild/build.rst
@@ -27,7 +27,7 @@ Download and install:
 * `Ninja <https://ninja-build.org/>`_
   (optional, use ``--nmake`` if not available; bundled in Visual Studio CMake component)
 
-* x86/x64: `Netwide Assembler (NASM) <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_
+* x86/AMD64: `Netwide Assembler (NASM) <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_
 
 Any version of Visual Studio 2017 or newer should be supported,
 including Visual Studio 2017 Community, or Build Tools for Visual Studio 2019.
@@ -42,7 +42,7 @@ Run ``build_prepare.py`` to configure the build::
 
     usage: winbuild\build_prepare.py [-h] [-v] [-d PILLOW_BUILD]
                                      [--depends PILLOW_DEPS]
-                                     [--architecture {x86,x64,ARM64}] [--nmake]
+                                     [--architecture {x86,AMD64,ARM64}] [--nmake]
                                      [--no-imagequant] [--no-fribidi]
 
     Download and generate build scripts for Pillow dependencies.
@@ -55,7 +55,7 @@ Run ``build_prepare.py`` to configure the build::
       --depends PILLOW_DEPS
                             directory used to store cached dependencies (default:
                             'winbuild\depends')
-      --architecture {x86,x64,ARM64}
+      --architecture {x86,AMD64,ARM64}
                             build architecture (default: same as host Python)
       --nmake               build dependencies using NMake instead of Ninja
       --no-imagequant       skip GPL-licensed optional dependency libimagequant
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 8e3757ca8..440e64d98 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -105,7 +105,7 @@ SF_PROJECTS = "https://sourceforge.net/projects"
 
 ARCHITECTURES = {
     "x86": {"vcvars_arch": "x86", "msbuild_arch": "Win32"},
-    "x64": {"vcvars_arch": "x86_amd64", "msbuild_arch": "x64"},
+    "AMD64": {"vcvars_arch": "x86_amd64", "msbuild_arch": "x64"},
     "ARM64": {"vcvars_arch": "x86_arm64", "msbuild_arch": "ARM64"},
 }
 
@@ -651,7 +651,7 @@ if __name__ == "__main__":
             (
                 "ARM64"
                 if platform.machine() == "ARM64"
-                else ("x86" if struct.calcsize("P") == 4 else "x64")
+                else ("x86" if struct.calcsize("P") == 4 else "AMD64")
             ),
         ),
         help="build architecture (default: same as host Python)",