1 files changed, 1 insertions, 1 deletions
diff --git a/library/std/src/sys/windows/os.rs b/library/std/src/sys/windows/os.rs
index 450bceae000..bcac996c024 100644
--- a/library/std/src/sys/windows/os.rs
+++ b/library/std/src/sys/windows/os.rs
@@ -134,7 +134,7 @@ impl Drop for Env {
 pub fn env() -> Env {
     unsafe {
         let ch = c::GetEnvironmentStringsW();
-        if ch as usize == 0 {
+        if ch.is_null() {
             panic!("failure getting env string from OS: {}", io::Error::last_os_error());
         }
         Env { base: ch, cur: ch }