diff --git a/sdc/Sdc.cc b/sdc/Sdc.cc
index e8cdbc8b..9cdbb63a 100644
--- a/sdc/Sdc.cc
+++ b/sdc/Sdc.cc
@@ -274,6 +274,10 @@ Sdc::deleteConstraints()
     checks->deleteContents();
     delete checks;
   }
+  for (auto pin_data_check : data_checks_to_map_) {
+    DataCheckSet *checks = pin_data_check.second;
+    delete checks;
+  }
 
   input_delays_.deleteContents();
   input_delay_pin_map_.deleteContents();