diff --git a/org/w3c/css/values/CssANPlusB.java b/org/w3c/css/values/CssANPlusB.java
index 58c7f937c..c98d92d3c 100644
--- a/org/w3c/css/values/CssANPlusB.java
+++ b/org/w3c/css/values/CssANPlusB.java
@@ -206,7 +206,9 @@ public String toString() {
                 sb.append('n');
             }
             if (b != null) {
-                sb.append(operator);
+            	if(operator != '\0') {
+            		sb.append(operator);
+            	}
                 sb.append(b.toPlainString());
             }
             representation = sb.toString();