diff --git a/HISTORY.rst b/HISTORY.rst
index 51bd288e..72d5fa89 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -16,6 +16,7 @@ PlatformIO Core 6
 6.1.2 (2022-07-??)
 ~~~~~~~~~~~~~~~~~~
 
+* Improved detection of Windows architecture (`issue #4353 <https://github.com/platformio/platformio-core/issues/4353>`_)
 * Fixed a regression bug when `libArchive <https://docs.platformio.org/en/latest/manifests/library-json/fields/build/libarchive.html>`__ option declared in the `library.json <https://docs.platformio.org/en/latest/manifests/library-json/index.html>`__ manifest was ignored (`issue #4351 <https://github.com/platformio/platformio-core/issues/4351>`_)
 * Fixed an issue when the `pio pkg publish <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_publish.html>`__ command didn't work with Python 3.6 (`issue #4352 <https://github.com/platformio/platformio-core/issues/4352>`_)
 
diff --git a/platformio/util.py b/platformio/util.py
index f235c2ee..f6800b4f 100644
--- a/platformio/util.py
+++ b/platformio/util.py
@@ -139,11 +139,14 @@ def singleton(cls):
 
 
 def get_systype():
-    type_ = platform.system().lower()
+    system = platform.system().lower()
     arch = platform.machine().lower()
-    if type_ == "windows" and "x86" in arch:
-        arch = "amd64" if "64" in arch else "x86"
-    return "%s_%s" % (type_, arch) if arch else type_
+    if system == "windows":
+        if not arch:  # issue #4353
+            arch = "x86_" + platform.architecture()[0]
+        if "x86" in arch:
+            arch = "amd64" if "64" in arch else "x86"
+    return "%s_%s" % (system, arch) if arch else system
 
 
 def pioversion_to_intstr():