diff --git a/search/Levelize.cc b/search/Levelize.cc
index 074ec759..9bfdacde 100644
--- a/search/Levelize.cc
+++ b/search/Levelize.cc
@@ -135,7 +135,7 @@ Levelize::levelize()
 
   findRoots();
   findBackEdges();
-  VertexSeq topo_sorted = findToplologicalOrder();
+  VertexSeq topo_sorted = findTopologicalOrder();
   assignLevels(topo_sorted);
   ensureLatchLevels();
 
@@ -345,7 +345,7 @@ Levelize::findUnvisitedVertices()
 ////////////////////////////////////////////////////////////////
 
 VertexSeq
-Levelize::findToplologicalOrder()
+Levelize::findTopologicalOrder()
 {
   Stats stats(debug_, report_);
   std::map<Vertex*, int> in_degree;
diff --git a/search/Levelize.hh b/search/Levelize.hh
index 7a5f8408..a1a9a383 100644
--- a/search/Levelize.hh
+++ b/search/Levelize.hh
@@ -74,7 +74,7 @@ protected:
   void levelize();
   void findRoots();
   VertexSeq sortedRootsWithFanout();
-  VertexSeq findToplologicalOrder();
+  VertexSeq findTopologicalOrder();
   void assignLevels(VertexSeq &topo_sorted);
   void recordLoop(Edge *edge,
                   EdgeSeq &path);