diff --git a/usr.sbin/bhyve/xmsr.c b/usr.sbin/bhyve/xmsr.c
--- a/usr.sbin/bhyve/xmsr.c
+++ b/usr.sbin/bhyve/xmsr.c
@@ -124,6 +124,14 @@
 			 */
 			*val = 0x000a1003;
 			break;
+		case MSR_IA32_FEATURE_CONTROL:
+			/*
+			 * Windows guests check this MSR.
+			 * Set the lock bit to avoid writes
+			 * to this MSR.
+			 */
+			*val = IA32_FEATURE_CONTROL_LOCK;
+			break;
 		default:
 			error = -1;
 			break;