1 files changed, 1 insertions, 1 deletions
diff --git a/ruby.c b/ruby.c
index fa21bb53b1..b3986dc625 100644
--- a/ruby.c
+++ b/ruby.c
@@ -863,7 +863,7 @@ proc_options(int argc, char **argv, struct cmdline_options *opt)
 		}
 		else {
                     rb_raise(rb_eRuntimeError,
-			"invalid option -\\x%02x  (-h will show valid options)",
+			"invalid option -\\x%02X  (-h will show valid options)",
                         (int)(unsigned char)*s);
 		}
 	    }