diff --git a/src/api/plugin/plugin.cpp b/src/api/plugin/plugin.cpp
index c73935a3..34fa2049 100644
--- a/src/api/plugin/plugin.cpp
+++ b/src/api/plugin/plugin.cpp
@@ -176,20 +176,6 @@ size_t Plugin::NumOverrideFormIDs() const {
   return numOverrideRecords_;
 }
 
-std::set<FormId> Plugin::OverlapFormIDs(const Plugin& plugin) const {
-  set<FormId> formIds(getFormIds());
-  set<FormId> otherFormIds(plugin.getFormIds());
-  set<FormId> overlap;
-
-  set_intersection(begin(formIds),
-                   end(formIds),
-                   begin(otherFormIds),
-                   end(otherFormIds),
-                   inserter(overlap, end(overlap)));
-
-  return overlap;
-}
-
 bool Plugin::IsValid(const std::string& filename, const GameType gameType, const boost::filesystem::path& dataPath) {
   BOOST_LOG_TRIVIAL(trace) << "Checking to see if \"" << filename << "\" is a valid plugin.";
 
diff --git a/src/api/plugin/plugin.h b/src/api/plugin/plugin.h
index 94386bec..7971c3c5 100644
--- a/src/api/plugin/plugin.h
+++ b/src/api/plugin/plugin.h
@@ -63,7 +63,6 @@ public:
 
   //Load ordering functions.
   size_t NumOverrideFormIDs() const;
-  std::set<libespm::FormId> OverlapFormIDs(const Plugin& plugin) const;
 
   // Validity checks.
   static bool IsValid(const std::string& filename, const GameType gameType, const boost::filesystem::path& dataPath);
@@ -82,7 +81,6 @@ private:
   std::string version_;  //Obtained from description field.
   uint32_t crc_;
   std::set<Tag> tags_;
-  std::vector<Message> messages_;
 
   //Useful caches.
   size_t numOverrideRecords_;
diff --git a/src/tests/api/internals/plugin/plugin_test.h b/src/tests/api/internals/plugin/plugin_test.h
index 720b9c6c..cfb25998 100644
--- a/src/tests/api/internals/plugin/plugin_test.h
+++ b/src/tests/api/internals/plugin/plugin_test.h
@@ -269,36 +269,6 @@ TEST_P(PluginTest, doFormIDsOverlapShouldReturnTrueIfOnePluginOverridesTheOthers
   EXPECT_TRUE(plugin1.DoFormIDsOverlap(plugin2));
   EXPECT_TRUE(plugin2.DoFormIDsOverlap(plugin1));
 }
-
-TEST_P(PluginTest, overlapFormIDsShouldReturnAnEmptySetForTwoPluginsWithOnlyHeadersLoaded) {
-  Plugin plugin1(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankEsm, true);
-  Plugin plugin2(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankMasterDependentEsm, true);
-
-  EXPECT_TRUE(plugin1.OverlapFormIDs(plugin2).empty());
-  EXPECT_TRUE(plugin2.OverlapFormIDs(plugin1).empty());
-}
-
-TEST_P(PluginTest, overlapFormIDsShouldReturnAnEmptySetIfThePluginsHaveUnrelatedRecords) {
-  Plugin plugin1(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankEsm, false);
-  Plugin plugin2(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankEsp, false);
-
-  EXPECT_TRUE(plugin1.OverlapFormIDs(plugin2).empty());
-  EXPECT_TRUE(plugin2.OverlapFormIDs(plugin1).empty());
-}
-
-TEST_P(PluginTest, overlapFormIDsShouldReturnTheFormIDsOfRecordsAddedByOnePluginAndOverriddenByTheOther) {
-  Plugin plugin1(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankEsm, false);
-  Plugin plugin2(game_.Type(), game_.DataPath(), game_.GetLoadOrderHandler(), blankMasterDependentEsm, false);
-
-  std::set<libespm::FormId> expectedFormIds({
-      libespm::FormId(blankEsm, std::vector<std::string>(), 0xCF0),
-      libespm::FormId(blankEsm, std::vector<std::string>(), 0xCF1),
-      libespm::FormId(blankEsm, std::vector<std::string>(), 0xCF2),
-      libespm::FormId(blankEsm, std::vector<std::string>(), 0xCF3),
-  });
-  EXPECT_EQ(expectedFormIds, plugin1.OverlapFormIDs(plugin2));
-  EXPECT_EQ(expectedFormIds, plugin2.OverlapFormIDs(plugin1));
-}
 }
 }