diff --git a/src/libextra/test.rs b/src/libextra/test.rs
index 82b62c7dfc0..73f6d2e1bda 100644
--- a/src/libextra/test.rs
+++ b/src/libextra/test.rs
@@ -745,7 +745,7 @@ fn get_concurrency() -> uint {
             let opt_n: Option<uint> = FromStr::from_str(s);
             match opt_n {
                 Some(n) if n > 0 => n,
-                _ => fail!("RUST_TEST_TASKS is `%s`, should be a non-negative integer.", s)
+                _ => fail!("RUST_TEST_TASKS is `%s`, should be a positive integer.", s)
             }
         }
         None => {
diff --git a/src/test/run-fail/test-threads-invalid-value.rs b/src/test/run-fail/test-tasks-invalid-value.rs
similarity index 92%
rename from src/test/run-fail/test-threads-invalid-value.rs
rename to src/test/run-fail/test-tasks-invalid-value.rs
index 0050d24e1d0..74531deb58e 100644
--- a/src/test/run-fail/test-threads-invalid-value.rs
+++ b/src/test/run-fail/test-tasks-invalid-value.rs
@@ -11,7 +11,7 @@
 // This checks that RUST_TEST_TASKS not being 1, 2, ... is detected
 // properly.
 
-// error-pattern:should be a non-negative integer
+// error-pattern:should be a positive integer
 // compile-flags: --test
 // exec-env:RUST_TEST_TASKS=foo