diff --git a/src/app/commands/cmd_select_palette.cpp b/src/app/commands/cmd_select_palette.cpp
index a5177616b..ce48ce31d 100644
--- a/src/app/commands/cmd_select_palette.cpp
+++ b/src/app/commands/cmd_select_palette.cpp
@@ -197,10 +197,8 @@ void SelectPaletteColorsCommand::onExecute(Context* context)
       }
     }
 
-    if (m_modifier == Modifier::UnusedColors) {
-      for (int i=0; i<usedEntries.size(); ++i)
-        usedEntries[i] = !usedEntries[i];
-    }
+    if (m_modifier == Modifier::UnusedColors)
+      usedEntries.invert();
     context->setSelectedColors(usedEntries);
   }
   else if (m_modifier == Modifier::UsedTiles ||
@@ -217,10 +215,8 @@ void SelectPaletteColorsCommand::onExecute(Context* context)
       }
     }
 
-    if (m_modifier == Modifier::UnusedTiles) {
-      for (int i=0; i<usedTiles.size(); ++i)
-        usedTiles[i] = !usedTiles[i];
-    }
+    if (m_modifier == Modifier::UnusedTiles)
+      usedTiles.invert();
     context->setSelectedTiles(usedTiles);
   }
 }
diff --git a/src/doc/palette_picks.h b/src/doc/palette_picks.h
index 8bd2bc343..26cb29c2c 100644
--- a/src/doc/palette_picks.h
+++ b/src/doc/palette_picks.h
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2019 Igara Studio S.A.
+// Copyright (c) 2019-2021 Igara Studio S.A.
 // Copyright (c) 2001-2017 David Capello
 //
 // This file is released under the terms of the MIT license.
@@ -80,6 +80,11 @@ namespace doc {
       return result;
     }
 
+    void invert() {
+      for (int i=0; i<size(); ++i)
+        m_items[i] = !m_items[i];
+    }
+
   private:
     list_type m_items;
   };