diff --git a/ide/lazarusidestrconsts.pas b/ide/lazarusidestrconsts.pas
index 14ad16a34c..d4264af31e 100644
--- a/ide/lazarusidestrconsts.pas
+++ b/ide/lazarusidestrconsts.pas
@@ -2792,6 +2792,7 @@ resourcestring
   lisPLDOnlinePackagesCannotBeDeleted = 'Online packages cannot be deleted';
   lisPESortFilesAlphabetically = 'Sort files alphabetically';
   lisPEShowDirectoryHierarchy = 'Show directory hierarchy';
+  lisPEOffSortForReorder = 'To reorder items, disable alphabetical sorting';
   lisPEShowPropsPanel = 'Show properties panel';
   lisClearFilter = 'Clear filter';
   dlgCaseSensitive = '&Case sensitive';
diff --git a/ide/projectinspector.pas b/ide/projectinspector.pas
index e4fe79389d..06e18a7be3 100644
--- a/ide/projectinspector.pas
+++ b/ide/projectinspector.pas
@@ -58,7 +58,7 @@ uses
   Classes, SysUtils,
   // LCL
   LCLType, LCLIntf, LResources, Forms, Controls, Buttons, ComCtrls, Menus, Dialogs,
-  ExtCtrls, StdCtrls, Graphics,
+  ExtCtrls, StdCtrls, Graphics, LCLStrConsts,
   // LazControls
   TreeFilterEdit,
   // LazUtils
@@ -659,20 +659,36 @@ procedure TProjectInspectorForm.MoveDependencyUpClick(Sender: TObject);
 var
   Dependency: TPkgDependency;
 begin
-  Dependency:=GetSingleSelectedDependency;
-  if SortAlphabetically or (Dependency=nil) or Dependency.Removed
-  or (Dependency.PrevRequiresDependency=nil) then exit;
-  LazProject.MoveRequiredDependencyUp(Dependency);
+  if SortAlphabetically then
+  begin
+    IDEMessageDialog(rsMtWarning, lisPEOffSortForReorder, mtWarning, [mbOK]);
+    exit;
+  end;
+
+  Dependency := GetSingleSelectedDependency;
+  if (Dependency = nil) or Dependency.Removed then
+    exit;
+
+  if assigned(Dependency.PrevRequiresDependency) then
+    LazProject.MoveRequiredDependencyUp(Dependency);
 end;
 
 procedure TProjectInspectorForm.MoveDependencyDownClick(Sender: TObject);
 var
   Dependency: TPkgDependency;
 begin
-  Dependency:=GetSingleSelectedDependency;
-  if SortAlphabetically or (Dependency=nil) or Dependency.Removed
-  or (Dependency.NextRequiresDependency=nil) then exit;
-  LazProject.MoveRequiredDependencyDown(Dependency);
+  if SortAlphabetically then
+  begin
+    IDEMessageDialog(rsMtWarning, lisPEOffSortForReorder, mtWarning, [mbOK]);
+    exit;
+  end;
+
+  Dependency := GetSingleSelectedDependency;
+  if (Dependency = nil) or Dependency.Removed then
+    exit;
+
+  if assigned(Dependency.NextRequiresDependency) then
+    LazProject.MoveRequiredDependencyDown(Dependency);
 end;
 
 procedure TProjectInspectorForm.PropsGroupBoxResize(Sender: TObject);