@@ -112,11 +112,11 @@
 				    @"%[prog]: Unknown option: --%[opt]",
 				    @"prog", [OFApplication programName],
 				    @"opt", optionsParser.lastLongOption)];
 			else {
 				OFString *optStr = [OFString stringWithFormat:
-				    @"%c", optionsParser.lastOption];
+				    @"%C", optionsParser.lastOption];
 				[OFStdErr writeLine:
 				    OF_LOCALIZED(@"unknown_option",
 				    @"%[prog]: Unknown option: -%[opt]",
 				    @"prog", [OFApplication programName],
 				    @"opt", optStr)];