diff --git a/search/Sta.cc b/search/Sta.cc
index bdbf6e93..320e0178 100644
--- a/search/Sta.cc
+++ b/search/Sta.cc
@@ -4291,8 +4291,15 @@ Parasitics *
 Sta::makeConcreteParasitics(std::string_view name,
                             std::string_view filename)
 {
+  // Free the prior entry to avoid leaking it on overwrite.
+  std::string key(name);
+  auto it = parasitics_name_map_.find(key);
+  if (it != parasitics_name_map_.end()) {
+    delete it->second;
+    parasitics_name_map_.erase(it);
+  }
   Parasitics *parasitics = new ConcreteParasitics(name, filename, this);
-  parasitics_name_map_[std::string(name)] = parasitics;
+  parasitics_name_map_[key] = parasitics;
   return parasitics;
 }
 
diff --git a/test/make_concrete_parasitics_leak.ok b/test/make_concrete_parasitics_leak.ok
new file mode 100644
index 00000000..e69de29b
diff --git a/test/make_concrete_parasitics_leak.tcl b/test/make_concrete_parasitics_leak.tcl
new file mode 100644
index 00000000..51629d45
--- /dev/null
+++ b/test/make_concrete_parasitics_leak.tcl
@@ -0,0 +1,9 @@
+# Sta::makeConcreteParasitics map-overwrite leak repro.
+# Run under -fsanitize=address to verify no leak after the fix.
+read_liberty asap7_small.lib.gz
+read_verilog reg1_asap7.v
+link_design top
+# 1st read_spef
+read_spef -min reg1_asap7.spef
+# 2nd read_spef
+read_spef -min reg1_asap7.spef
diff --git a/test/regression_vars.tcl b/test/regression_vars.tcl
index b0cab790..ce037eff 100644
--- a/test/regression_vars.tcl
+++ b/test/regression_vars.tcl
@@ -154,6 +154,7 @@ record_public_tests {
   liberty_ccsn
   liberty_float_as_str
   liberty_latch3
+  make_concrete_parasitics_leak
   package_require
   path_group_names
   power_json