diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
index de7434d93d..34d93643fe 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -31,6 +31,7 @@
 [Sources]
   AmdSev.c
   Cmos.c
+  Cmos.h
   FeatureControl.c
   Fv.c
   MemDetect.c