1 files changed, 2 insertions, 2 deletions
diff --git a/src/libstd/rt/util.rs b/src/libstd/rt/util.rs
index 4023a0a4c10..f5727a38b69 100644
--- a/src/libstd/rt/util.rs
+++ b/src/libstd/rt/util.rs
@@ -51,7 +51,7 @@ pub fn min_stack() -> uint {
         0 => {}
         n => return n - 1,
     }
-    let amt = os::getenv("RUST_MIN_STACK").and_then(|s| s.parse());
+    let amt = os::getenv("RUST_MIN_STACK").and_then(|s| s.parse().ok());
     let amt = amt.unwrap_or(2 * 1024 * 1024);
     // 0 is our sentinel value, so ensure that we'll never see 0 after
     // initialization has run
@@ -64,7 +64,7 @@ pub fn min_stack() -> uint {
 pub fn default_sched_threads() -> uint {
     match os::getenv("RUST_THREADS") {
         Some(nstr) => {
-            let opt_n: Option<uint> = nstr.parse();
+            let opt_n: Option<uint> = nstr.parse().ok();
             match opt_n {
                 Some(n) if n > 0 => n,
                 _ => panic!("`RUST_THREADS` is `{}`, should be a positive integer", nstr)