diff --git a/devicemodel/include/virtio.h b/devicemodel/include/virtio.h
index f13cbc22d..16b1a8a00 100644
--- a/devicemodel/include/virtio.h
+++ b/devicemodel/include/virtio.h
@@ -229,6 +229,14 @@ enum {
 #define	VIRTIO_DEV_HDCP		0x8607
 #define	VIRTIO_DEV_COREU	0x8608
 
+/*
+ * VIRTIO_CONFIG_S_NEEDS_RESET is not defined
+ * in some environments's virtio_config.h
+ */
+#ifndef VIRTIO_CONFIG_S_NEEDS_RESET
+#define VIRTIO_CONFIG_S_NEEDS_RESET	0x40
+#endif
+
 /*
  * Bits in VIRTIO_PCI_ISR.  These apply only if not using MSI-X.
  *