@@ -486,11 +486,11 @@
 				    @"missing"
 				    @"prog", [OFApplication programName],
 				    @"opt", optionsParser.lastLongOption)];
 			else {
 				OFString *optStr = [OFString
-				    stringWithFormat: @"%c",
+				    stringWithFormat: @"%C",
 				    optionsParser.lastOption];
 				[OFStdErr writeLine:
 				    OF_LOCALIZED(@"argument_missing",
 				    @"%[prog]: Argument for option -%[opt] "
 				    @"missing",
@@ -516,11 +516,11 @@
 				    @"%[prog]: Unknown option: --%[opt]",
 				    @"prog", [OFApplication programName],
 				    @"opt", optionsParser.lastLongOption)];
 			else {
 				OFString *optStr = [OFString
-				    stringWithFormat: @"%c",
+				    stringWithFormat: @"%C",
 				    optionsParser.lastOption];
 				[OFStdErr writeLine:
 				    OF_LOCALIZED(@"unknown_option",
 				    @"%[prog]: Unknown option: -%[opt]",
 				    @"prog", [OFApplication programName],