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-rw-r--r--library/std/src/sys_common/thread.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/std/src/sys_common/thread.rs b/library/std/src/sys_common/thread.rs
index 76466b2b37b..8f5624bbce9 100644
--- a/library/std/src/sys_common/thread.rs
+++ b/library/std/src/sys_common/thread.rs
@@ -8,7 +8,7 @@ pub fn min_stack() -> usize {
         0 => {}
         n => return n - 1,
     }
-    let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
+    let amt = env::var_os("RUST_MIN_STACK").and_then(|s| s.to_str().and_then(|s| s.parse().ok()));
     let amt = amt.unwrap_or(imp::DEFAULT_MIN_STACK_SIZE);
 
     // 0 is our sentinel value, so ensure that we'll never see 0 after