diff --git a/kernel_config_fragment b/kernel_config_fragment
index c16acaf..ab18502 100644
--- a/kernel_config_fragment
+++ b/kernel_config_fragment
@@ -211,3 +211,6 @@ CONFIG_PCI_HOST_GENERIC=y
 # Also requires gem5 aarch64 options.
 # Not needed for initrd / initramfs.
 CONFIG_VIRTIO_PCI=y
+
+# For record and replay.
+CONFIG_8139CP=y