diff --git a/src/main/java/org/apache/maven/shared/dependency/tree/traversal/SerializingDependencyNodeVisitor.java b/src/main/java/org/apache/maven/shared/dependency/tree/traversal/SerializingDependencyNodeVisitor.java
index 759566a..6a7cb88 100644
--- a/src/main/java/org/apache/maven/shared/dependency/tree/traversal/SerializingDependencyNodeVisitor.java
+++ b/src/main/java/org/apache/maven/shared/dependency/tree/traversal/SerializingDependencyNodeVisitor.java
@@ -179,12 +179,12 @@
     {
         for ( int i = 1; i < depth; i++ )
         {
-            writer.append( tokens.getFillIndent( isLast( node, i ) ) );
+            writer.write( tokens.getFillIndent( isLast( node, i ) ) );
         }
 
         if ( depth > 0 )
         {
-            writer.append( tokens.getNodeIndent( isLast( node ) ) );
+            writer.write( tokens.getNodeIndent( isLast( node ) ) );
         }
     }