gistfile1.txt

diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
index d66c237514..76397aef94 100644
--- a/src/libstd/sys/unix/process/process_unix.rs
+++ b/src/libstd/sys/unix/process/process_unix.rs
@@ -327,7 +327,11 @@ impl Command {
             if ret == 0 {
                 Ok(Some(p))
             } else {
-                Err(io::Error::last_os_error())
+                Err(if cfg!(target_os = "macos") {
+                    io::Error::from_raw_os_error(ret)
+                } else {
+                    io::Error::last_os_error()
+                })
             }
         }
     }