diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index f8e081e..2baf920 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -984,6 +984,7 @@
     wchar_t _new_path[MAX_PATH+1], *new_path = _new_path;
     int result;
     wchar_t env[4] = L"=x:";
+    int is_unc_like_path;
 
     if(!SetCurrentDirectoryW(path))
         return FALSE;
@@ -1002,15 +1003,15 @@
             return FALSE;
         }
     }
-    if (wcsncmp(new_path, L"\\\\", 2) == 0 ||
-        wcsncmp(new_path, L"//", 2) == 0)
-        /* UNC path, nothing to do. */
-        return TRUE;
-    env[1] = new_path[0];
-    result = SetEnvironmentVariableW(env, new_path);
+    is_unc_like_path = (wcsncmp(new_path, L"\\\\", 2) == 0 ||
+                        wcsncmp(new_path, L"//", 2) == 0);
+    if (!is_unc_like_path) {
+        env[1] = new_path[0];
+        result = SetEnvironmentVariableW(env, new_path);
+    }
     if (new_path != _new_path)
         free(new_path);
-    return result;
+    return result ? TRUE : FALSE;
 }
 #endif