diff --git a/search/Sta.cc b/search/Sta.cc
index efbae24c..a46cd4b5 100644
--- a/search/Sta.cc
+++ b/search/Sta.cc
@@ -2728,6 +2728,25 @@ Sta::vertexArrival(Vertex *vertex,
   return arrival;
 }
 
+Required
+Sta::vertexRequired(Vertex *vertex,
+		    const MinMax *min_max)
+{
+  findRequired(vertex);
+  const MinMax *req_min_max = min_max->opposite();
+  Required required = req_min_max->initValue();
+  VertexPathIterator path_iter(vertex, this);
+  while (path_iter.hasNext()) {
+    const Path *path = path_iter.next();
+    if (path->minMax(this) == min_max) {
+      const Required path_required = path->required(this);
+      if (fuzzyGreater(path_required, required, req_min_max))
+	required = path_required;
+    }
+  }
+  return required;
+}
+
 Required
 Sta::vertexRequired(Vertex *vertex,
 		    const TransRiseFall *tr,
diff --git a/search/Sta.hh b/search/Sta.hh
index cf978e87..5884b6b8 100644
--- a/search/Sta.hh
+++ b/search/Sta.hh
@@ -976,13 +976,15 @@ public:
 			const TransRiseFall *tr,
 			const PathAnalysisPt *path_ap);
   Required vertexRequired(Vertex *vertex,
-			  const TransRiseFall *tr,
-			  const ClockEdge *clk_edge,
-			  const PathAnalysisPt *path_ap);
+			  const MinMax *min_max);
   // Min/max across all clock tags.
   Required vertexRequired(Vertex *vertex,
 			  const TransRiseFall *tr,
 			  const PathAnalysisPt *path_ap);
+  Required vertexRequired(Vertex *vertex,
+			  const TransRiseFall *tr,
+			  const ClockEdge *clk_edge,
+			  const PathAnalysisPt *path_ap);
   Slack pinSlack(const Pin *pin,
 		 const TransRiseFall *tr,
 		 const MinMax *min_max);
@@ -1131,8 +1133,10 @@ public:
 
   void setTclInterp(Tcl_Interp *interp);
   Tcl_Interp *tclInterp();
+  void ensureLevelized();
   // Ensure that the timing graph has been built.
   Graph *ensureGraph();
+  void ensureClkArrivals();
   Corner *cmdCorner() const;
   void setCmdCorner(Corner *corner);
   Corner *findCorner(const char *corner_name);
@@ -1230,8 +1234,6 @@ protected:
   virtual LibertyLibrary *readLibertyFile(const char *filename,
 					  bool infer_latches,
 					  Network *network);
-  void ensureLevelized();
-  void ensureClkArrivals();
   void delayCalcPreamble();
   void delaysInvalidFrom(Port *port);
   void delaysInvalidFromFanin(Port *port);