diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 2432715e43..eca4ddb7d3 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -141,9 +141,9 @@ VOID
 EFIAPI
 ArmGicSendSgiTo (
   IN  UINTN  GicDistributorBase,
-  IN  INTN   TargetListFilter,
-  IN  INTN   CPUTargetList,
-  IN  INTN   SgiId
+  IN  UINT8  TargetListFilter,
+  IN  UINT8  CPUTargetList,
+  IN  UINT8  SgiId
   )
 {
   MmioWrite32 (
diff --git a/ArmPkg/Include/Library/ArmGicLib.h b/ArmPkg/Include/Library/ArmGicLib.h
index 7253cda5b8..cede7a24b7 100644
--- a/ArmPkg/Include/Library/ArmGicLib.h
+++ b/ArmPkg/Include/Library/ArmGicLib.h
@@ -167,9 +167,9 @@ VOID
 EFIAPI
 ArmGicSendSgiTo (
   IN  UINTN  GicDistributorBase,
-  IN  INTN   TargetListFilter,
-  IN  INTN   CPUTargetList,
-  IN  INTN   SgiId
+  IN  UINT8  TargetListFilter,
+  IN  UINT8  CPUTargetList,
+  IN  UINT8  SgiId
   );
 
 /*