diff --git a/src/engine.c b/src/engine.c
index 6534b680..c01e269c 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -2748,7 +2748,7 @@ short Window_get_clicked_button(void)
         Hide_cursor();
         Window_select_normal_button(temp1->Pos_X,temp1->Pos_Y,temp1->Width,temp1->Height);
         Display_cursor();
-        // Slider_timer((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
+        Delay_with_active_mouse((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
         Hide_cursor();
         Window_unselect_normal_button(temp1->Pos_X,temp1->Pos_Y,temp1->Width,temp1->Height);
         Display_cursor();        
@@ -2795,7 +2795,7 @@ short Window_get_clicked_button(void)
       
       Display_cursor();
 
-      // Slider_timer((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
+      Delay_with_active_mouse((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
 
       Hide_cursor();
       Window_unselect_normal_button(temp3->Pos_X,temp3->Pos_Y,11,11);
@@ -2824,7 +2824,7 @@ short Window_get_clicked_button(void)
 
       Display_cursor();
 
-      // Slider_timer((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
+      Delay_with_active_mouse((Mouse_K==1)? Config.Delay_left_click_on_slider : Config.Delay_right_click_on_slider);
 
       Hide_cursor();
       Window_unselect_normal_button(temp3->Pos_X,temp3->Pos_Y+temp3->Height-11,11,11);
@@ -2930,7 +2930,7 @@ short Window_get_button_shortcut(void)
       Window_select_normal_button(temp->Pos_X,temp->Pos_Y,temp->Width,temp->Height);
       Display_cursor();
       
-      // Slider_timer(Config.Delay_right_click_on_slider);
+      Delay_with_active_mouse(Config.Delay_right_click_on_slider);
       
       Hide_cursor();
       Window_unselect_normal_button(temp->Pos_X,temp->Pos_Y,temp->Width,temp->Height);
@@ -3289,3 +3289,18 @@ void Remap_window_backgrounds(byte * conversion_table, int Min_Y, int Max_Y)
         }
   }
 }
+
+void Delay_with_active_mouse(int speed)
+{
+  Uint32 now;
+  Uint32 end;
+  end = SDL_GetTicks()+speed*10;
+  
+  Need_Timer_events=1;
+  
+  do
+  {
+    Get_input();
+    now = SDL_GetTicks();
+  } while (now<end);
+}
\ No newline at end of file
diff --git a/src/engine.h b/src/engine.h
index 897cd37b..28e774c6 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -111,4 +111,6 @@ void Pixel_background(int x_pos, int y_pos, byte color);
 /// Updates the status bar line with a color number.
 /// Used when hovering the menu palette.
 void Status_print_palette_color(byte color);
+
+void Delay_with_active_mouse(int delay);
 #endif
diff --git a/src/main.c b/src/main.c
index a3bedae9..7a933e54 100644
--- a/src/main.c
+++ b/src/main.c
@@ -149,13 +149,7 @@ void Error_function(int error_code, const char *filename, int line_number, const
     for (index=0;index<=255;index++)
       temp_palette[index].R=255;
     Set_palette(temp_palette);
-    SDL_Delay(500);
-    // TODO: Replace the above by a loop where cursor is active:
-    // Need_Timer_events=1
-    // Compute target=now+500
-    // Do
-    //   Get_input()
-    // While now<target
+    Delay_with_active_mouse(50); // Half a second of red flash
     Set_palette(Main_palette);
   }
   else