diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index 8df91c90768..ee0d190d729 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -340,7 +340,7 @@ fn usage(binary: &str) {
 only those tests that match are run.
 
 By default, all tests are run in parallel. This can be altered with the
-RUST_TEST_THRADS environment variable when running tests (set it to 1).
+RUST_TEST_THREADS environment variable when running tests (set it to 1).
 
 All tests have their standard output and standard error captured by default.
 This can be overridden with the --nocapture flag or the RUST_TEST_NOCAPTURE=1