Index: src/OFMutableURI.m
==================================================================
--- src/OFMutableURI.m
+++ src/OFMutableURI.m
@@ -41,11 +41,11 @@
 - (void)setScheme: (OFString *)scheme
 {
 	void *pool = objc_autoreleasePoolPush();
 	OFString *old = _percentEncodedScheme;
 
-	_percentEncodedScheme = [[scheme
+	_percentEncodedScheme = [[scheme.lowercaseString
 	    stringByAddingPercentEncodingWithAllowedCharacters:
 	    [OFCharacterSet URISchemeAllowedCharacterSet]] copy];
 
 	[old release];
 
@@ -52,19 +52,22 @@
 	objc_autoreleasePoolPop(pool);
 }
 
 - (void)setPercentEncodedScheme: (OFString *)percentEncodedScheme
 {
-	OFString *old;
+	void *pool = objc_autoreleasePoolPush();
+	OFString *old = _percentEncodedScheme;
 
 	if (percentEncodedScheme != nil)
 		OFURIVerifyIsEscaped(percentEncodedScheme,
 		    [OFCharacterSet URISchemeAllowedCharacterSet]);
 
-	old = _percentEncodedScheme;
-	_percentEncodedScheme = [percentEncodedScheme copy];
+	_percentEncodedScheme = [percentEncodedScheme.lowercaseString copy];
+
 	[old release];
+
+	objc_autoreleasePoolPop(pool);
 }
 
 - (void)setHost: (OFString *)host
 {
 	void *pool = objc_autoreleasePoolPush();