diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/swf/SwfFlashDevelopExporter.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/swf/SwfFlashDevelopExporter.java
index 2324b852a..657310d49 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/swf/SwfFlashDevelopExporter.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/swf/SwfFlashDevelopExporter.java
@@ -108,7 +108,7 @@ public class SwfFlashDevelopExporter {
             simpleName = simpleName.substring(0, simpleName.lastIndexOf("."));
         }
 
-        String simpleNameNoSpaces = simpleName.replace(" ", "");
+        String simpleNameNoSpaces = simpleName.replace(" ", "").replace("_", "");
 
         SetBackgroundColorTag bgColorTag = swf.getBackgroundColor();