Index: utils/ofhttp/OFHTTP.m
==================================================================
--- utils/ofhttp/OFHTTP.m
+++ utils/ofhttp/OFHTTP.m
@@ -16,10 +16,11 @@
 #include "config.h"
 
 #import "OFApplication.h"
 #import "OFArray.h"
 #import "OFData.h"
+#import "OFDate.h"
 #import "OFDictionary.h"
 #import "OFFile.h"
 #import "OFFileManager.h"
 #import "OFHTTPClient.h"
 #import "OFHTTPRequest.h"
@@ -964,10 +965,27 @@
 			    @"exception", e)];
 
 			_errorCode = 1;
 			goto next;
 		}
+
+#ifdef OF_MACOS
+		@try {
+			OFString *quarantine = [OFString stringWithFormat:
+			    @"0000;%08" @PRIx64 @";ofhttp;",
+			    (uint64_t)[[OFDate date] timeIntervalSince1970]];
+			OFData *quarantineData = [OFData
+			    dataWithItems: quarantine.UTF8String
+				    count: quarantine.UTF8StringLength];
+			[[OFFileManager defaultManager]
+			    setExtendedAttributeData: quarantineData
+					     forName: @"com.apple.quarantine"
+					ofItemAtPath: _currentFileName];
+		} @catch (OFGetItemAttributesFailedException *e) {
+			/* Ignore */
+		}
+#endif
 	}
 
 	if (!_quiet) {
 		_progressBar = [[ProgressBar alloc]
 		    initWithLength: _length