diff --git a/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.cpp b/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.cpp
index d9582d99de..4dfd5f64a0 100644
--- a/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.cpp
+++ b/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.cpp
@@ -5,7 +5,6 @@
 #include <string>
 
 #include "Common/CommonTypes.h"
-#include "Common/FileUtil.h"
 #include "Common/Logging/Log.h"
 #include "Common/StringUtil.h"
 #include "Core/PowerPC/PPCAnalyst.h"
@@ -18,15 +17,9 @@
 #include "Core/PowerPC/SignatureDB/DSYSignatureDB.h"
 #include "Core/PowerPC/SignatureDB/MEGASignatureDB.h"
 
-SignatureDB::SignatureDB(SignatureDB::HandlerType handler) : m_handler(CreateFormatHandler(handler))
+namespace
 {
-}
-
-SignatureDB::SignatureDB(const std::string& file_path) : SignatureDB(GetHandlerType(file_path))
-{
-}
-
-SignatureDB::HandlerType SignatureDB::GetHandlerType(const std::string& file_path)
+SignatureDB::HandlerType GetHandlerType(const std::string& file_path)
 {
   if (StringEndsWith(file_path, ".csv"))
     return SignatureDB::HandlerType::CSV;
@@ -35,8 +28,7 @@ SignatureDB::HandlerType SignatureDB::GetHandlerType(const std::string& file_pat
   return SignatureDB::HandlerType::DSY;
 }
 
-std::unique_ptr<SignatureDBFormatHandler>
-SignatureDB::CreateFormatHandler(SignatureDB::HandlerType handler) const
+std::unique_ptr<SignatureDBFormatHandler> CreateFormatHandler(SignatureDB::HandlerType handler)
 {
   switch (handler)
   {
@@ -49,6 +41,15 @@ SignatureDB::CreateFormatHandler(SignatureDB::HandlerType handler) const
     return std::make_unique<MEGASignatureDB>();
   }
 }
+}  // Anonymous namespace
+
+SignatureDB::SignatureDB(HandlerType handler) : m_handler(CreateFormatHandler(handler))
+{
+}
+
+SignatureDB::SignatureDB(const std::string& file_path) : SignatureDB(GetHandlerType(file_path))
+{
+}
 
 void SignatureDB::Clear()
 {
@@ -217,6 +218,4 @@ u32 HashSignatureDB::ComputeCodeChecksum(u32 offsetStart, u32 offsetEnd)
   return sum;
 }
 
-SignatureDBFormatHandler::~SignatureDBFormatHandler()
-{
-}
+SignatureDBFormatHandler::~SignatureDBFormatHandler() = default;
diff --git a/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.h b/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.h
index 01277c9bd5..efcd22ea37 100644
--- a/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.h
+++ b/Source/Core/Core/PowerPC/SignatureDB/SignatureDB.h
@@ -27,8 +27,6 @@ public:
   explicit SignatureDB(HandlerType handler);
   explicit SignatureDB(const std::string& file_path);
 
-  static HandlerType GetHandlerType(const std::string& file_path);
-
   void Clear();
   // Does not clear. Remember to clear first if that's what you want.
   bool Load(const std::string& file_path);
@@ -41,7 +39,6 @@ public:
   bool Add(u32 start_addr, u32 size, const std::string& name);
 
 private:
-  std::unique_ptr<SignatureDBFormatHandler> CreateFormatHandler(HandlerType handler) const;
   std::unique_ptr<SignatureDBFormatHandler> m_handler;
 };
 
@@ -66,23 +63,22 @@ class HashSignatureDB : public SignatureDBFormatHandler
 public:
   struct DBFunc
   {
-    u32 size;
+    u32 size = 0;
     std::string name;
     std::string object_name;
     std::string object_location;
-    DBFunc() : size(0) {}
   };
   using FuncDB = std::map<u32, DBFunc>;
 
   static u32 ComputeCodeChecksum(u32 offsetStart, u32 offsetEnd);
 
-  virtual void Clear() override;
-  virtual void List() const override;
+  void Clear() override;
+  void List() const override;
 
-  virtual void Populate(const PPCSymbolDB* func_db, const std::string& filter = "") override;
-  virtual void Apply(PPCSymbolDB* func_db) const override;
+  void Populate(const PPCSymbolDB* func_db, const std::string& filter = "") override;
+  void Apply(PPCSymbolDB* func_db) const override;
 
-  virtual bool Add(u32 startAddr, u32 size, const std::string& name) override;
+  bool Add(u32 startAddr, u32 size, const std::string& name) override;
 
 protected:
   // Map from signature to function. We store the DB in this map because it optimizes the