Index: src/OFString.m
==================================================================
--- src/OFString.m
+++ src/OFString.m
@@ -324,10 +324,16 @@
 	self = [super init];
 
 	@try {
 		size_t i, j;
 		const uint16_t *table;
+
+		if (encoding == OF_STRING_ENCODING_UTF_8 &&
+		    len >= 3 && !memcmp(str, "\xEF\xBB\xBF", 3)) {
+			str += 3;
+			len -= 3;
+		}
 
 		string = [self allocMemoryWithSize: len + 1];
 		length = len;
 
 		if (encoding == OF_STRING_ENCODING_UTF_8) {

Index: tests/OFStringTests.m
==================================================================
--- tests/OFStringTests.m
+++ tests/OFStringTests.m
@@ -106,12 +106,12 @@
 
 	TEST(@"-[lower]", R([s[0] lower]) && [s[0] isEqual: @"3𝄞1€sät"] &&
 	    R([s[1] lower]) && [s[1] isEqual: @"abc"])
 
 	TEST(@"+[stringWithCString:length:]",
-	    (s[0] = [OFMutableString stringWithCString: "foobar"
-					      length: 3]) &&
+	    (s[0] = [OFMutableString stringWithCString: "\xEF\xBB\xBF" "foobar"
+					      length: 6]) &&
 	    [s[0] isEqual: @"foo"])
 
 	TEST(@"+[stringWithContentsOfFile:encoding]", (s[1] = [OFString
 	    stringWithContentsOfFile: @"testfile.txt"
 			    encoding: OF_STRING_ENCODING_ISO_8859_1]) &&