diff --git a/rtl/embedded/sysutils.pp b/rtl/embedded/sysutils.pp
index c50644618d..862ee5b27f 100644
--- a/rtl/embedded/sysutils.pp
+++ b/rtl/embedded/sysutils.pp
@@ -52,13 +52,13 @@ begin
   result := -1;
 end;
 
-function FileGetDate(Handle: THandle) : Int64;
+function FileGetDate(Handle: THandle) : TOSTimestamp;
 begin
   result := -1;
 end;
 
 
-function FileSetDate(Handle: THandle; Age: LongInt) : Longint;
+function FileSetDate(Handle: THandle; Age: TOSTimestamp) : Longint;
 begin
   result := -1;
 end;
@@ -128,7 +128,7 @@ begin
 end;
 
 
-Function FileAge (Const FileName : RawByteString): Int64;
+Function FileAge (Const FileName : RawByteString): TOSTimestamp;
 begin
   result := -1;
 end;