X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=library%2Fstd%2Fsrc%2Fsys%2Fwindows%2Fprocess.rs;h=14de2530842f8da93d16558e109ee6ad50419c8f;hb=365a3586a94dc9ca675ddb02a86e116e8161481a;hp=81dbea4a067399755a1fd029fc3ed514c6c44e05;hpb=54bdfa125722c9ee6fadb61818f861b1102fd300;p=rust.git

diff --git a/library/std/src/sys/windows/process.rs b/library/std/src/sys/windows/process.rs
index 81dbea4a067..14de2530842 100644
--- a/library/std/src/sys/windows/process.rs
+++ b/library/std/src/sys/windows/process.rs
@@ -530,6 +530,12 @@ fn make_envp(maybe_env: Option<BTreeMap<EnvKey, OsString>>) -> io::Result<(*mut
     if let Some(env) = maybe_env {
         let mut blk = Vec::new();
 
+        // If there are no environment variables to set then signal this by
+        // pushing a null.
+        if env.is_empty() {
+            blk.push(0);
+        }
+
         for (k, v) in env {
             blk.extend(ensure_no_nuls(k.0)?.encode_wide());
             blk.push('=' as u16);