diff --git a/meta/classes-recipe/python_pep517.bbclass b/meta/classes-recipe/python_pep517.bbclass
index d6246af5c2..06b23d3cba 100644
--- a/meta/classes-recipe/python_pep517.bbclass
+++ b/meta/classes-recipe/python_pep517.bbclass
@@ -30,6 +30,22 @@ PEP517_INSTALL_PYTHON:class-native = "nativepython3"
 # pypa/installer option to control the bytecode compilation
 INSTALL_WHEEL_COMPILE_BYTECODE ?= "--compile-bytecode=0"
 
+# Force the wheel's platform tag to reflect the target machine rather than the
+# build host. Without this, extension-module wheels bake the build host's arch
+# (e.g. linux_x86_64) into <pkg>.dist-info/WHEEL via distutils/sysconfig's
+# get_platform(), which breaks reproducibility across autobuilder workers of
+# different architectures. Pure-python wheels ignore this variable and remain
+# tagged "any".
+#
+# HOST_ARCH is class-scoped by bitbake:
+#   - target:     HOST_ARCH == TARGET_ARCH (reproducible across workers)
+#   - native:     HOST_ARCH == BUILD_ARCH  (matches worker arch, unpackaged)
+#   - cross:      HOST_ARCH == BUILD_ARCH
+#   - nativesdk:  HOST_ARCH == SDK_ARCH
+# so a single expression covers every class without producing an empty tag
+# (which python 3.14 + wheel >=0.44 rejects with "Bad wheel filename").
+export _PYTHON_HOST_PLATFORM = "linux-${HOST_ARCH}"
+
 # PEP517 doesn't have a specific configure step, so set an empty do_configure to avoid
 # running base_do_configure.
 python_pep517_do_configure () {