diff --git a/src/com/versusoft/packages/jodl/OdtUtils.java b/src/com/versusoft/packages/jodl/OdtUtils.java
index 38aef83..a0babaa 100755
--- a/src/com/versusoft/packages/jodl/OdtUtils.java
+++ b/src/com/versusoft/packages/jodl/OdtUtils.java
@@ -595,9 +595,11 @@ private static void normalizePictureIds(Node root){
                 Node picIdNode = node.getAttributes().getNamedItem("draw:name");
                 if(picIdNode != null) {
                     String picId = picIdNode.getNodeValue();
-                    picId = picId.trim().replace(" ", "_");
-                    logger.info("Normalized picture id from '"+picIdNode.getNodeValue()+"' to '"+picId+"'");
-                    picIdNode.setTextContent(picId);
+                    String newId = picId.trim().replace(" ", "_");
+                    if(!picId.equals(newId)) { 
+                        logger.info("Normalized picture id from '"+picId+"' to '"+newId+"'");
+                        picIdNode.setTextContent(newId);
+                    }
                 }
             }
         }