diff --git a/OvmfPkg/VirtioBlkDxe/VirtioBlk.h b/OvmfPkg/VirtioBlkDxe/VirtioBlk.h
index e846dab514..c769991839 100644
--- a/OvmfPkg/VirtioBlkDxe/VirtioBlk.h
+++ b/OvmfPkg/VirtioBlkDxe/VirtioBlk.h
@@ -15,6 +15,9 @@
 
 **/
 
+#ifndef _VIRTIO_BLK_DXE_H_
+#define _VIRTIO_BLK_DXE_H_
+
 #include <Protocol/BlockIo.h>
 #include <Protocol/ComponentName.h>
 #include <Protocol/DriverBinding.h>
@@ -291,3 +294,5 @@ VirtioBlkGetDeviceName (
   IN  CHAR8                       *Language,
   OUT CHAR16                      **ControllerName
   );
+
+#endif // _VIRTIO_BLK_DXE_H_