diff --git a/src/state.cpp b/src/state.cpp
index 7b1877b..251d46b 100644
--- a/src/state.cpp
+++ b/src/state.cpp
@@ -104,7 +104,7 @@
   BOOST_REVERSE_FOREACH (ConstLeafPtr leaf, m_leaves.get<ordered>())
     {
       size_t entryLength = 0;
-      entryLength += ndn::prependNonNegativeIntegerBlock(block, tlv::SeqNo, leaf->getSeq());
+      entryLength += prependNonNegativeIntegerBlock(block, tlv::SeqNo, leaf->getSeq());
       entryLength += leaf->getSessionName().wireEncode(block);
       entryLength += block.prependVarNumber(entryLength);
       entryLength += block.prependVarNumber(tlv::StateLeaf);