diff --git a/gcc/ada/exp_pakd.adb b/gcc/ada/exp_pakd.adb
index 7dcf241e247..d125db17b32 100644
--- a/gcc/ada/exp_pakd.adb
+++ b/gcc/ada/exp_pakd.adb
@@ -1520,12 +1520,12 @@ package body Exp_Pakd is
       Get_Base_And_Bit_Offset (Prefix (N), Base, Offset);
 
       Rewrite (N,
-        Unchecked_Convert_To (Universal_Integer,
+        Unchecked_Convert_To (Standard_Natural,
           Make_Op_Mod (Loc,
             Left_Opnd => Offset,
             Right_Opnd => Make_Integer_Literal (Loc, System_Storage_Unit))));
 
-      Analyze_And_Resolve (N, Universal_Integer);
+      Analyze_And_Resolve (N, Standard_Natural);
    end Expand_Packed_Bit_Reference;
 
    ------------------------------------