diff --git a/setup/installer/osx/app/sign.py b/setup/installer/osx/app/sign.py
index 9793406f17..fea4f8519d 100644
--- a/setup/installer/osx/app/sign.py
+++ b/setup/installer/osx/app/sign.py
@@ -23,7 +23,7 @@ def codesign(items):
     # If you get errors while codesigning that look like "A timestamp was
     # expected but not found" it means that codesign  failed to contact Apple's time
     # servers, probably due to network congestion, so add --timestamp=none to
-    # this command line. That means the signature will fail one your code
+    # this command line. That means the signature will fail once your code
     # signing key expires and key revocation wont work, but...
     subprocess.check_call(['codesign', '-s', 'Kovid Goyal'] + list(items))