diff --git a/src/libcore/os.rs b/src/libcore/os.rs
index 1b68ffc6f38fe..f828da8409000 100644
--- a/src/libcore/os.rs
+++ b/src/libcore/os.rs
@@ -966,9 +966,6 @@ mod tests {
         setenv(~"USERPROFILE", ~"/home/MountainView");
         assert os::homedir() == some(~"/home/MountainView");
 
-        setenv(~"USERPROFILE", ~"/home/MountainView");
-        assert os::homedir() == some(~"/home/MountainView");
-
         setenv(~"HOME", ~"/home/MountainView");
         setenv(~"USERPROFILE", ~"/home/PaloAlto");
         assert os::homedir() == some(~"/home/MountainView");