diff --git a/x86/include/kvm/barrier.h b/x86/include/kvm/barrier.h
index c11a239..480276f 100644
--- a/x86/include/kvm/barrier.h
+++ b/x86/include/kvm/barrier.h
@@ -7,6 +7,7 @@
  * Provide the dependencies here - we can drop these wrappers once
  * the header is fixed upstream:
  */
+#include <stdbool.h>
 #include <linux/stringify.h>
 #include <linux/bitops.h>
 #include <asm/alternative.h>