diff --git a/OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.inf b/OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.inf
index fb2ec2039f..25056febf3 100644
--- a/OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.inf
+++ b/OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.inf
@@ -31,8 +31,8 @@
 [Sources]
   CsmSupportLib.c
   LegacyInterrupt.c
-  LegacyRegion.c
   LegacyPlatform.c
+  LegacyRegion.c
 
 [Packages]
   MdePkg/MdePkg.dec