1 files changed, 1 insertions, 3 deletions
diff --git a/MdePkg/Include/IndustryStandard/PciExpress21.h b/MdePkg/Include/IndustryStandard/PciExpress21.h
index b437ca5c1e..c6faa9425b 100644
--- a/MdePkg/Include/IndustryStandard/PciExpress21.h
+++ b/MdePkg/Include/IndustryStandard/PciExpress21.h
@@ -714,9 +714,7 @@ typedef struct {
   UINT16                                      DpaControl;
   UINT8                                       DpaPowerAllocationArray[1];
 } PCI_EXPRESS_EXTENDED_CAPABILITIES_DYNAMIC_POWER_ALLOCATION;
-
-#define PCI_EXPRESS_EXTENDED_CAPABILITY_DYNAMIC_POWER_ALLOCATION_GET_SUBSTATE_MAX(POWER)  (UINT16)(((POWER->DpaCapability)&0x0000000F))
-
+#define PCI_EXPRESS_EXTENDED_CAPABILITY_DYNAMIC_POWER_ALLOCATION_GET_SUBSTATE_MAX(POWER)  (UINT32)(((POWER->DpaCapability)&0x0000000F))
 #define PCI_EXPRESS_EXTENDED_CAPABILITY_LATENCE_TOLERANCE_REPORTING_ID    0x0018
 #define PCI_EXPRESS_EXTENDED_CAPABILITY_LATENCE_TOLERANCE_REPORTING_VER1  0x1