diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index d3e4417656e9a..697e0b4b68f13 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -101,6 +101,12 @@ pub struct VarsOs {
     inner: env_imp::Env,
 }
 
+#[stable(feature = "env_vars_unimpl_send_sync", since = "CURRENT_RUSTC_VERSION")]
+impl !Send for VarsOs {}
+
+#[stable(feature = "env_vars_unimpl_send_sync", since = "CURRENT_RUSTC_VERSION")]
+impl !Sync for VarsOs {}
+
 /// Returns an iterator of (variable, value) pairs of strings, for all the
 /// environment variables of the current process.
 ///
diff --git a/library/std/src/sys/env/common.rs b/library/std/src/sys/env/common.rs
index 87e86e2947fad..d620c8b4acdd9 100644
--- a/library/std/src/sys/env/common.rs
+++ b/library/std/src/sys/env/common.rs
@@ -17,9 +17,6 @@ impl fmt::Debug for Env {
     }
 }
 
-impl !Send for Env {}
-impl !Sync for Env {}
-
 impl Iterator for Env {
     type Item = (OsString, OsString);
     fn next(&mut self) -> Option<(OsString, OsString)> {