Index: src/OFLocalization.m
==================================================================
--- src/OFLocalization.m
+++ src/OFLocalization.m
@@ -125,13 +125,13 @@
 			    initWithCString: tmp
 				   encoding: OF_STRING_ENCODING_ASCII
 				     length: tmpLen];
 		}
 
-		tmpLen = strlen(tmp);
+		tmpLen = strlen(locale);
 		for (size_t i = 0; i < tmpLen; i++)
-			tmp[i] = of_ascii_tolower(tmp[i]);
+			locale[i] = of_ascii_tolower(locale[i]);
 
 		_language = [[OFString alloc]
 		    initWithCString: locale
 			   encoding: OF_STRING_ENCODING_ASCII
 			     length: tmpLen];