diff --git a/FmpDevicePkg/Library/FmpDependencyLib/FmpDependencyLib.c b/FmpDevicePkg/Library/FmpDependencyLib/FmpDependencyLib.c
index 50662e74e0..11ee83d3ea 100644
--- a/FmpDevicePkg/Library/FmpDependencyLib/FmpDependencyLib.c
+++ b/FmpDevicePkg/Library/FmpDependencyLib/FmpDependencyLib.c
@@ -228,7 +228,7 @@ EvaluateDependency (
 {
   EFI_STATUS     Status;
   UINT8          *Iterator;
-  UINT8          Index;
+  UINTN          Index;
   DEPEX_ELEMENT  Element1;
   DEPEX_ELEMENT  Element2;
   GUID           ImageTypeId;