diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineCompactedFont.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineCompactedFont.java
index 5ee395971..36b9cea96 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineCompactedFont.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineCompactedFont.java
@@ -320,11 +320,11 @@ public final class DefineCompactedFont extends FontTag implements DrawableTag {
     @Override
     public String getCharacters(List<Tag> tags) {
         FontType ft = fonts.get(0);
-        String ret = "";
+        StringBuilder ret = new StringBuilder(ft.glyphInfo.size());
         for (GlyphInfoType gi : ft.glyphInfo) {
-            ret += (char) gi.glyphCode;
+            ret.append((char) gi.glyphCode);
         }
-        return ret;
+        return ret.toString();
     }
 
     @Override
diff --git a/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java b/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
index b5354b0bb..afb7c2458 100644
--- a/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
+++ b/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
@@ -291,6 +291,7 @@ public class TagTreeContextMenu extends JPopupMenu implements ActionListener {
                                     tag.getSwf().tags.remove(tag);
                                     tag.setSwf(targetSwf);
                                     targetSwf.tags.add(tag);
+                                    tag.setModified(true);
                                     mainPanel.refreshTree();
                                 }
                             });