diff --git a/scapy/utils.py b/scapy/utils.py
index 59a5403c371544c1bcd5b0b79ce74973e966e3d4..84117b1985a19aef4b1bfbbff30d9479dede750b 100644
--- a/scapy/utils.py
+++ b/scapy/utils.py
@@ -914,7 +914,7 @@ class RawPcapWriter:
                 usec = int(round((t-it)*1000000))
         self.f.write(struct.pack(self.endian+"IIII", sec, usec, caplen, wirelen))
         self.f.write(packet)
-        if self.gz and self.sync:
+        if self.sync:
             self.f.flush()
 
     def flush(self):