Index: src/OFDate.m
==================================================================
--- src/OFDate.m
+++ src/OFDate.m
@@ -348,11 +348,11 @@
 
 	element = [OFXMLElement elementWithName: [self className]
 				      namespace: OF_SERIALIZATION_NS];
 
 	secondsString = [OFString stringWithFormat: @"%" @PRId64, seconds];
-	microsecondsString = [OFString stringWithFormat: @"%" @PRId64,
+	microsecondsString = [OFString stringWithFormat: @"%" @PRIu32,
 							 microseconds];
 
 	[element addAttributeWithName: @"seconds"
 			  stringValue: secondsString];
 	[element addAttributeWithName: @"microseconds"