diff --git a/EdkCompatibilityPkg/Compatibility/PciCfg2ToPciCfgThunk/PciCfg2ToPciCfgThunk.c b/EdkCompatibilityPkg/Compatibility/PciCfg2ToPciCfgThunk/PciCfg2ToPciCfgThunk.c
index 18c272fc92..3ce6c1df02 100644
--- a/EdkCompatibilityPkg/Compatibility/PciCfg2ToPciCfgThunk/PciCfg2ToPciCfgThunk.c
+++ b/EdkCompatibilityPkg/Compatibility/PciCfg2ToPciCfgThunk/PciCfg2ToPciCfgThunk.c
@@ -439,7 +439,7 @@ PciCfg2Modify (
 
   Status = (*PeiServices)->LocatePpi (
              PeiServices,
-             &gEcpPeiPciCfgPpiGuid,
+             &gEfiPciCfgPpiInServiceTableGuid,
              0,
              NULL,
              (VOID **)&PciCfg