diff --git a/components/fpdebug/fpdmemorytools.pas b/components/fpdebug/fpdmemorytools.pas
index c5d14d4266..d20abc77d8 100644
--- a/components/fpdebug/fpdmemorytools.pas
+++ b/components/fpdebug/fpdmemorytools.pas
@@ -1299,7 +1299,7 @@ begin
 
 
         if SourceReadSize <= ConvData.DestSize then begin
-          move(ReadData^, ADest^, Min(SizeOf(TmpVal) ,ConvData.DestSize)); // Little Endian only
+          move(ReadData^, ADest^, Min(SizeOf(TmpVal), Int64(ConvData.DestSize))); // Little Endian only
           ReadData := ADest;
         end;