diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 7f4bb248fc..f49a376b14 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -225,10 +225,10 @@ ArmGicEndOfInterrupt (
 VOID
 EFIAPI
 ArmGicSetInterruptPriority (
-  IN UINTN  GicDistributorBase,
-  IN UINTN  GicRedistributorBase,
-  IN UINTN  Source,
-  IN UINTN  Priority
+  IN UINTN   GicDistributorBase,
+  IN UINTN   GicRedistributorBase,
+  IN UINTN   Source,
+  IN UINT32  Priority
   )
 {
   UINT32                 RegOffset;
diff --git a/ArmPkg/Include/Library/ArmGicLib.h b/ArmPkg/Include/Library/ArmGicLib.h
index 93ce8aeb19..32a06485f9 100644
--- a/ArmPkg/Include/Library/ArmGicLib.h
+++ b/ArmPkg/Include/Library/ArmGicLib.h
@@ -210,10 +210,10 @@ ArmGicSetPriorityMask (
 VOID
 EFIAPI
 ArmGicSetInterruptPriority (
-  IN UINTN  GicDistributorBase,
-  IN UINTN  GicRedistributorBase,
-  IN UINTN  Source,
-  IN UINTN  Priority
+  IN UINTN   GicDistributorBase,
+  IN UINTN   GicRedistributorBase,
+  IN UINTN   Source,
+  IN UINT32  Priority
   );
 
 VOID