diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index 59eda563a2..2251f4ca99 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -15,6 +15,7 @@
 
 [Includes]
   Include
+  Csm/Include
 
 [LibraryClasses]
   ##  @libraryclass  Loads and boots a Linux kernel image