diff --git a/EmulatorPkg/Unix/Host/BerkeleyPacketFilter.c b/EmulatorPkg/Unix/Host/BerkeleyPacketFilter.c
index 8d0eb0d197..540340f25f 100644
--- a/EmulatorPkg/Unix/Host/BerkeleyPacketFilter.c
+++ b/EmulatorPkg/Unix/Host/BerkeleyPacketFilter.c
@@ -216,6 +216,7 @@ EmuSnpStart (
   }
 
   Status = EFI_SUCCESS;
+  Private->ReadBuffer = NULL;
   if (Private->BpfFd == 0) {
     Status = OpenBpfFileDescriptor (Private, &Private->BpfFd);
     if (EFI_ERROR (Status)) {