diff --git a/src/main/java/osm/surveyor/task/util/JsonProperties.java b/src/main/java/osm/surveyor/task/util/JsonProperties.java
index aa0eb23..3b07b75 100644
--- a/src/main/java/osm/surveyor/task/util/JsonProperties.java
+++ b/src/main/java/osm/surveyor/task/util/JsonProperties.java
@@ -35,7 +35,7 @@
 		c1 = outStr(c1, sb, "path", this.path);
 		c1 = outStr(c1, sb, "id", this.id);
 		c1 = outStr(c1, sb, "version", this.version);
-		c1 = out(c1, sb, "prefcode", getPrefcode().toString());
+		c1 = out(c1, sb, "prefcode", getPrefcode());
 		c1 = outStr(c1, sb, "prefname", getPrefname());
 		sb.append("}");
 		return sb.toString();
diff --git a/src/main/java/osm/surveyor/task/util/JsonTemple.java b/src/main/java/osm/surveyor/task/util/JsonTemple.java
index 60975a2..f962cc0 100644
--- a/src/main/java/osm/surveyor/task/util/JsonTemple.java
+++ b/src/main/java/osm/surveyor/task/util/JsonTemple.java
@@ -57,6 +57,23 @@
 		return c1;
 	}
 
+	public boolean out(boolean c, StringBuffer sb, String name, Long l) {
+		boolean c1 = c;
+		if (l != null) {
+			if (c1) {
+				sb.append(",");
+			}
+			else {
+				c1 = true;
+			}
+			if (name != null) {
+				sb.append("\""+ name +"\":");
+			}
+			sb.append(l.toString());
+		}
+		return c1;
+	}
+
 	public boolean outStr(boolean c, StringBuffer sb, String name, JsonTemple obj) {
 		boolean c1 = c;
 		if (obj != null) {