diff --git a/packages/fcl-db/src/base/bufdataset.pas b/packages/fcl-db/src/base/bufdataset.pas
index 21249846fd..fcbc5e3193 100644
--- a/packages/fcl-db/src/base/bufdataset.pas
+++ b/packages/fcl-db/src/base/bufdataset.pas
@@ -1999,7 +1999,8 @@ begin
     begin
     SetUniDirectional(AValue);
     ClearIndexes;
-    FPacketRecords := 1; // temporary
+    if IsUniDirectional then
+      FPacketRecords := 1; // UniDirectional dataset does not allow FPacketRecords<0
     end;
 end;