Index: src/OFMutableString_UTF8.m
==================================================================
--- src/OFMutableString_UTF8.m
+++ src/OFMutableString_UTF8.m
@@ -475,14 +475,10 @@
 - (void)deleteCharactersInRange: (of_range_t)range
 {
 	size_t start = range.start;
 	size_t end = range.start + range.length;
 
-	if (start > end)
-		@throw [OFInvalidArgumentException exceptionWithClass: isa
-							     selector: _cmd];
-
 	if (end > s->length)
 		@throw [OFOutOfRangeException exceptionWithClass: isa];
 
 	s->hashed = NO;
 	s->length -= end - start;
@@ -511,14 +507,10 @@
 {
 	size_t start = range.start;
 	size_t end = range.start + range.length;
 	size_t newCStringLength, newLength;
 
-	if (start > end)
-		@throw [OFInvalidArgumentException exceptionWithClass: isa
-							     selector: _cmd];
-
 	if (end > s->length)
 		@throw [OFOutOfRangeException exceptionWithClass: isa];
 
 	newLength = s->length - (end - start) + [replacement length];
 

Index: tests/OFStringTests.m
==================================================================
--- tests/OFStringTests.m
+++ tests/OFStringTests.m
@@ -455,16 +455,18 @@
 
 	EXPECT_EXCEPTION(@"Detect OoR in -[deleteCharactersInRange:] #2",
 	    OFOutOfRangeException,
 	    [s[0] deleteCharactersInRange: of_range(4, 0)])
 
-	EXPECT_EXCEPTION(@"Detect OoR in -[replaceCharactersInRange:withString:] #1",
+	EXPECT_EXCEPTION(@"Detect OoR in "
+	    @"-[replaceCharactersInRange:withString:] #1",
 	    OFOutOfRangeException,
 	    [s[0] replaceCharactersInRange: of_range(2, 2)
 				withString: @""])
 
-	EXPECT_EXCEPTION(@"Detect OoR in -[replaceCharactersInRange:withString:] #2",
+	EXPECT_EXCEPTION(@"Detect OoR in "
+	    @"-[replaceCharactersInRange:withString:] #2",
 	    OFOutOfRangeException,
 	    [s[0] replaceCharactersInRange: of_range(4, 0)
 				withString: @""])
 
 	TEST(@"-[replaceOccurrencesOfString:withString:]",