diff --git a/cibuildwheel/windows.py b/cibuildwheel/windows.py
index c94515e7..ad844844 100644
--- a/cibuildwheel/windows.py
+++ b/cibuildwheel/windows.py
@@ -18,11 +18,18 @@ IS_RUNNING_ON_AZURE = Path('C:\\hostedtoolcache').exists()
 IS_RUNNING_ON_TRAVIS = os.environ.get('TRAVIS_OS_NAME') == 'windows'
 
 
+def normalize(x: [Union[str, PathLike]], cwd: Optional[PathLike]) -> str:
+    if hasattr(x, 'resolve'):
+        return str((cwd / x if cwd is not None else x).resolve())
+    else:
+        return x
+
+
 def shell(args: Sequence[Union[str, PathLike]], env: Optional[Dict[str, str]] = None,
           cwd: Optional[str] = None) -> int:
-    command = ' '.join(str(a) for a in args)
+    command = ' '.join(normalize(a, cwd) for a in args)
     print(f'+ {command}')
-    return subprocess.check_call(list(str(a) for a in args), env=env, cwd=cwd)
+    return subprocess.check_call(list(normalize(a, cwd) for a in args), env=env, cwd=cwd)
 
 
 def get_nuget_args(version: str, arch: str) -> List[str]: