Index: src/OFMutableString.m
==================================================================
--- src/OFMutableString.m
+++ src/OFMutableString.m
@@ -265,21 +265,21 @@
 
 - (void)reverse
 {
 	size_t i, j, len = length / 2;
 
-	madvise(string, len, MADV_SEQUENTIAL);
+	madvise(string, length, MADV_SEQUENTIAL);
 
 	/* We reverse all bytes and restore UTF-8 later, if necessary */
 	for (i = 0, j = length - 1; i < len; i++, j--) {
 		string[i] ^= string[j];
 		string[j] ^= string[i];
 		string[i] ^= string[j];
 	}
 
 	if (!isUTF8) {
-		madvise(string, len, MADV_NORMAL);
+		madvise(string, length, MADV_NORMAL);
 		return;
 	}
 
 	for (i = 0; i < length; i++) {
 		/* ASCII */
@@ -286,17 +286,17 @@
 		if (OF_LIKELY(!(string[i] & 0x80)))
 			continue;
 
 		/* A start byte can't happen first as we reversed everything */
 		if (OF_UNLIKELY(string[i] & 0x40)) {
-			madvise(string, len, MADV_NORMAL);
+			madvise(string, length, MADV_NORMAL);
 			@throw [OFInvalidEncodingException newWithClass: isa];
 		}
 
 		/* Next byte must not be ASCII */
 		if (OF_UNLIKELY(length < i + 1 || !(string[i + 1] & 0x80))) {
-			madvise(string, len, MADV_NORMAL);
+			madvise(string, length, MADV_NORMAL);
 			@throw [OFInvalidEncodingException newWithClass: isa];
 		}
 
 		/* Next byte is the start byte */
 		if (OF_LIKELY(string[i + 1] & 0x40)) {
@@ -308,11 +308,11 @@
 			continue;
 		}
 
 		/* Second next byte must not be ASCII */
 		if (OF_UNLIKELY(length < i + 2 || !(string[i + 2] & 0x80))) {
-			madvise(string, len, MADV_NORMAL);
+			madvise(string, length, MADV_NORMAL);
 			@throw [OFInvalidEncodingException newWithClass: isa];
 		}
 
 		/* Second next byte is the start byte */
 		if (OF_LIKELY(string[i + 2] & 0x40)) {
@@ -324,11 +324,11 @@
 			continue;
 		}
 
 		/* Third next byte must not be ASCII */
 		if (OF_UNLIKELY(length < i + 3 || !(string[i + 3] & 0x80))) {
-			madvise(string, len, MADV_NORMAL);
+			madvise(string, length, MADV_NORMAL);
 			@throw [OFInvalidEncodingException newWithClass: isa];
 		}
 
 		/* Third next byte is the start byte */
 		if (OF_LIKELY(string[i + 3] & 0x40)) {
@@ -343,15 +343,15 @@
 			i += 3;
 			continue;
 		}
 
 		/* UTF-8 does not allow more than 4 bytes per character */
-		madvise(string, len, MADV_NORMAL);
+		madvise(string, length, MADV_NORMAL);
 		@throw [OFInvalidEncodingException newWithClass: isa];
 	}
 
-	madvise(string, len, MADV_NORMAL);
+	madvise(string, length, MADV_NORMAL);
 }
 
 - (void)upper
 {
 	[self _applyTable: of_unicode_upper_table