diff --git a/include/sta/Liberty.hh b/include/sta/Liberty.hh
index 1468597b..707e8ea0 100644
--- a/include/sta/Liberty.hh
+++ b/include/sta/Liberty.hh
@@ -340,8 +340,6 @@ protected:
   SupplyVoltageMap supply_voltage_map_;
   LibertyCellSeq *buffers_;
 
-  // Set if any library has rise/fall capacitances.
-  static bool found_rise_fall_caps_;
   static constexpr float input_threshold_default_ = .5;
   static constexpr float output_threshold_default_ = .5;
   static constexpr float slew_lower_threshold_default_ = .2;
diff --git a/liberty/Liberty.cc b/liberty/Liberty.cc
index 158b14f1..d525e050 100644
--- a/liberty/Liberty.cc
+++ b/liberty/Liberty.cc
@@ -43,8 +43,6 @@ typedef Set<TimingModel*> TimingModelSet;
 typedef Set<FuncExpr*> FuncExprSet;
 typedef Set<LatchEnable*> LatchEnableSet;
 
-bool LibertyLibrary::found_rise_fall_caps_ = false;
-
 void
 initLiberty()
 {