diff --git a/tools/ci/testrun/script/test_os/test_os.py b/tools/ci/testrun/script/test_os/test_os.py
index d288aede3ca..34d6118b668 100644
--- a/tools/ci/testrun/script/test_os/test_os.py
+++ b/tools/ci/testrun/script/test_os/test_os.py
@@ -69,7 +69,7 @@ def test_getprime(p):
 def test_stdio(p):
     if p.board in do_not_support:
         pytest.skip("unsupported at {}".format(p.board))
-    ret = p.sendCommand("fopencookie_test", "fopencokie tests were succesfull.")
+    ret = p.sendCommand("fopencookie_test", "fopencokie tests were successful.")
     assert ret == 0
     ret = p.sendCommand("fmemopen_test", "FAILED: 0")
     assert ret == 0