diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
index a40a31f7c2..a4393dffbd 100644
--- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
@@ -1872,6 +1872,7 @@ GetCpuidFw (
     UINT32                 XSaveSize;
 
     XssMsr.Uint64 = 0;
+    Compacted     = FALSE;
     if (EcxIn == 1) {
       /*
        * The PPR and APM aren't clear on what size should be encoded in