diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.c b/UefiCpuPkg/CpuMpPei/CpuMpPei.c
index eaf99c73cd..3b72f444e9 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.c
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.c
@@ -302,7 +302,7 @@ PeiStartupThisAP (
   @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to this
                                   service returning.
   @retval EFI_UNSUPPORTED         Switching the BSP is not supported.
-  @retval EFI_SUCCESS             The calling processor is an AP.
+  @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_NOT_FOUND           The processor with the handle specified by
                                   ProcessorNumber does not exist.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or a disabled
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.h b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
index 0836593efc..aae56658ec 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.h
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
@@ -271,7 +271,7 @@ PeiStartupThisAP (
   @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to this
                                   service returning.
   @retval EFI_UNSUPPORTED         Switching the BSP is not supported.
-  @retval EFI_SUCCESS             The calling processor is an AP.
+  @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_NOT_FOUND           The processor with the handle specified by
                                   ProcessorNumber does not exist.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or a disabled