1 files changed, 3 insertions, 1 deletions
diff --git a/src/RDFWorld.cpp b/src/RDFWorld.cpp
index d68919d..71a231c 100644
--- a/src/RDFWorld.cpp
+++ b/src/RDFWorld.cpp
@@ -87,7 +87,9 @@ World::blank_id()
 {
 	std::ostringstream ss;
 	ss << "n" << _next_blank_id++;
-	return Node(*this, Node::BLANK, ss.str());
+	Node result = Node(*this, Node::BLANK, ss.str());
+	assert(result.to_string() == ss.str());
+	return result;
 }