diff --git a/hv-rhel6.x/hv/arch/x86/include/lis/asm/mshyperv.h b/hv-rhel6.x/hv/arch/x86/include/lis/asm/mshyperv.h
index 5870b0e84..1783fa306 100644
--- a/hv-rhel6.x/hv/arch/x86/include/lis/asm/mshyperv.h
+++ b/hv-rhel6.x/hv/arch/x86/include/lis/asm/mshyperv.h
@@ -4,6 +4,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/clocksource.h>
+#include <linux/hv_compat.h>
 #include <lis/asm/hyperv.h>
 
 /*