diff --git a/cibuildwheel/linux.py b/cibuildwheel/linux.py
index bf1e6548..c84026be 100644
--- a/cibuildwheel/linux.py
+++ b/cibuildwheel/linux.py
@@ -48,19 +48,20 @@ def get_python_configurations(build_selector):
     for c in python_configurations:
         if not build_selector(c.identifier):
             continue
-        if platform.machine == "x86_64":
+        pm = platform.machine()
+        if pm == "x86_64":
             if c.identifier.endswith('x86_64') or c.identifier.endswith('i686'):
                 configurations.append(c)
-        if platform.machine == "i686":
+        if pm == "i686":
             if c.identifier.endswith('i686'):
                 configuration.append(c)
-        elif platform.machine == "aarch64":
+        elif pm == "aarch64":
             if c.identifier.endswith('aarch64'):
                 configurations.append(c)
-        elif platform.machine == "ppc64le":
+        elif pm == "ppc64le":
             if c.identifier.endswith('ppc64le'):
                 configurations.append(c)
-        elif platform.machine == "s390x":
+        elif pm == "s390x":
             if c.identifier.endswith('s390x'):
                 configurations.append(c)
 
diff --git a/test/shared/utils.py b/test/shared/utils.py
index 26512995..056fe6dc 100644
--- a/test/shared/utils.py
+++ b/test/shared/utils.py
@@ -81,15 +81,14 @@ def expected_wheels(package_name, package_version, manylinux_versions=None,
     # {python tag} and {abi tag} are closely related to the python interpreter used to build the wheel
     # so we'll merge them below as python_abi_tag
 
-
     python_abi_tags = ['cp35-cp35m', 'cp36-cp36m', 'cp37-cp37m', 'cp38-cp38']
     extra_python_abi_tags = ['cp27-cp27m', 'pp27-pypy_73', 'pp36-pypy36_pp73']
 
     if platform == 'linux':
-        if pm.machine not in ['x86_64', 'i686']:
+        if pm.machine() not in ['x86_64', 'i686']:
             if manylinux_versions is None:
                 manylinux_versions = ['manylinux2014']
-            architectures = {'cp': [pm.machine]}
+            architectures = {'cp': [pm.machine()]}
         else:
             if manylinux_versions is None:
                 manylinux_versions = ['manylinux1', 'manylinux2010']
@@ -108,14 +107,15 @@ def expected_wheels(package_name, package_version, manylinux_versions=None,
         def get_platform_tags(python_abi_tag):
             return platform_tags[python_abi_tag[:2]]
     elif platform == 'windows':
-        python_api_tag += extra_python_abi_tags
+        python_abi_tags += extra_python_abi_tags
         platform_tags = {'cp': ['win32', 'win_amd64'], 'pp': ['win32']}
 
         def get_platform_tags(python_abi_tag):
             return platform_tags[python_abi_tag[:2]]
 
     elif platform == 'macos':
-        python_api_tag += extra_python_abi_tags
+        python_abi_tags += extra_python_abi_tags
+
         def get_platform_tags(python_abi_tag):
             default_version = '10.7' if python_abi_tag.startswith('pp') else '10.9'
             return ['macosx_{}_x86_64'.format((macosx_deployment_target or default_version).replace('.', '_'))]