diff --git a/lib/libkvm/kvm_alpha.c b/lib/libkvm/kvm_alpha.c
index 98417a0fd13..59bc2c6b467 100644
--- a/lib/libkvm/kvm_alpha.c
+++ b/lib/libkvm/kvm_alpha.c
@@ -29,6 +29,8 @@
  */
 
 #include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
 #include <sys/user.h>
 #include <sys/proc.h>
 #include <sys/stat.h>