diff --git a/src/lib/getopts.rs b/src/lib/getopts.rs
index d6e209739d00..c6850a0125ee 100644
--- a/src/lib/getopts.rs
+++ b/src/lib/getopts.rs
@@ -116,7 +116,7 @@ fn fail_str(fail_ f) -> str {
             "Required option '" + nm + "' missing."
         }
         case (option_duplicated(?nm)) {
-            "option '" + nm + "' given more than once."
+            "Option '" + nm + "' given more than once."
         }
         case (unexpected_argument(?nm)) {
             "Option " + nm + " does not take an argument."