diff --git a/utils/yangutils/src/test/resources/PrefixInvalidValue.yang b/utils/yangutils/src/test/resources/PrefixInvalidValue.yang
new file mode 100644
index 0000000..40f7617
--- /dev/null
+++ b/utils/yangutils/src/test/resources/PrefixInvalidValue.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix -On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}