diff --git a/src/ai/ai_info.cpp b/src/ai/ai_info.cpp
index 29dfdf81f4..fac36129a3 100644
--- a/src/ai/ai_info.cpp
+++ b/src/ai/ai_info.cpp
@@ -129,11 +129,6 @@ bool AIInfo::CanLoadFromVersion(int version) const
 }
 
 
-AILibrary::~AILibrary()
-{
-	free(this->category);
-}
-
 /* static */ void AILibrary::RegisterAPI(Squirrel *engine)
 {
 	/* Create the AILibrary class, and add the RegisterLibrary function */
@@ -154,7 +149,7 @@ AILibrary::~AILibrary()
 	}
 
 	/* Cache the category */
-	if (!library->CheckMethod("GetCategory") || !library->engine->CallStringMethodStrdup(*library->SQ_instance, "GetCategory", &library->category, MAX_GET_OPS)) {
+	if (!library->CheckMethod("GetCategory") || !library->engine->CallStringMethod(*library->SQ_instance, "GetCategory", &library->category, MAX_GET_OPS)) {
 		delete library;
 		return SQ_ERROR;
 	}
diff --git a/src/ai/ai_info.hpp b/src/ai/ai_info.hpp
index a87b6cc36c..df8e6b65d7 100644
--- a/src/ai/ai_info.hpp
+++ b/src/ai/ai_info.hpp
@@ -56,8 +56,7 @@ private:
 /** All static information from an AI library like name, version, etc. */
 class AILibrary : public ScriptInfo {
 public:
-	AILibrary() : ScriptInfo(), category(nullptr) {};
-	~AILibrary();
+	AILibrary() : ScriptInfo() {};
 
 	/**
 	 * Register the functions of this class.
@@ -72,10 +71,10 @@ public:
 	/**
 	 * Get the category this library is in.
 	 */
-	const char *GetCategory() const { return this->category; }
+	const std::string &GetCategory() const { return this->category; }
 
 private:
-	const char *category; ///< The category this library is in.
+	std::string category; ///< The category this library is in.
 };
 
 #endif /* AI_INFO_HPP */
diff --git a/src/game/game_info.cpp b/src/game/game_info.cpp
index 2144ebd377..88347c5157 100644
--- a/src/game/game_info.cpp
+++ b/src/game/game_info.cpp
@@ -99,11 +99,6 @@ bool GameInfo::CanLoadFromVersion(int version) const
 }
 
 
-GameLibrary::~GameLibrary()
-{
-	free(this->category);
-}
-
 /* static */ void GameLibrary::RegisterAPI(Squirrel *engine)
 {
 	/* Create the GameLibrary class, and add the RegisterLibrary function */
@@ -124,7 +119,7 @@ GameLibrary::~GameLibrary()
 	}
 
 	/* Cache the category */
-	if (!library->CheckMethod("GetCategory") || !library->engine->CallStringMethodStrdup(*library->SQ_instance, "GetCategory", &library->category, MAX_GET_OPS)) {
+	if (!library->CheckMethod("GetCategory") || !library->engine->CallStringMethod(*library->SQ_instance, "GetCategory", &library->category, MAX_GET_OPS)) {
 		delete library;
 		return SQ_ERROR;
 	}
diff --git a/src/game/game_info.hpp b/src/game/game_info.hpp
index 76dbfd546f..d5dd48701d 100644
--- a/src/game/game_info.hpp
+++ b/src/game/game_info.hpp
@@ -48,8 +48,7 @@ private:
 /** All static information from an Game library like name, version, etc. */
 class GameLibrary : public ScriptInfo {
 public:
-	GameLibrary() : ScriptInfo(), category(nullptr) {};
-	~GameLibrary();
+	GameLibrary() : ScriptInfo() {};
 
 	/**
 	 * Register the functions of this class.
@@ -64,10 +63,10 @@ public:
 	/**
 	 * Get the category this library is in.
 	 */
-	const char *GetCategory() const { return this->category; }
+	const std::string &GetCategory() const { return this->category; }
 
 private:
-	const char *category; ///< The category this library is in.
+	std::string category; ///< The category this library is in.
 };
 
 #endif /* GAME_INFO_HPP */