diff --git a/sources/Helpers.h b/sources/Helpers.h
index efe93397..1ae98d52 100644
--- a/sources/Helpers.h
+++ b/sources/Helpers.h
@@ -35,7 +35,7 @@ inline std::string_view trim(std::string_view s)
 
 inline constexpr unsigned int Fnv1aBasis = 0x811C9DC5;
 inline constexpr unsigned int Fnv1aPrime = 0x01000193;
-inline constexpr unsigned int hash(const char *s, unsigned int h = Fnv1aBasis)
+inline constexpr unsigned int   hash(const char *s, unsigned int h = Fnv1aBasis)
 {
     return !*s ? h : hash(s + 1, static_cast<unsigned int>((h ^ *s) * static_cast<unsigned long long>(Fnv1aPrime)));
 }
diff --git a/sources/ParserMain.cpp b/sources/ParserMain.cpp
index 525b3ed9..29650257 100644
--- a/sources/ParserMain.cpp
+++ b/sources/ParserMain.cpp
@@ -14,7 +14,7 @@ public:
     int getNumMasters() const noexcept { return numMasters; }
     int getNumCurves() const noexcept { return numCurves; }
 protected:
-    void callback(std::string_view header, std::vector<sfz::Opcode> members) override
+    void callback(std::string_view header, std::vector<sfz::Opcode> members) final
     {
         switch (hash(header))
         {
diff --git a/sources/Synth.h b/sources/Synth.h
index aeee3797..c519ad90 100644
--- a/sources/Synth.h
+++ b/sources/Synth.h
@@ -12,14 +12,14 @@ namespace sfz
 class Synth: public Parser
 {
 public:
-    bool loadSfzFile(const std::filesystem::path& file) override;
+    bool loadSfzFile(const std::filesystem::path& file) final;
     int getNumRegions() const noexcept { return regions.size(); }
     int getNumGroups() const noexcept { return numGroups; }
     int getNumMasters() const noexcept { return numMasters; }
     int getNumCurves() const noexcept { return numCurves; }
-    const Region* getRegionView(int idx) { return idx < regions.size() ? &regions[idx] : nullptr; }
+    const Region* getRegionView(int idx) const noexcept { return idx < regions.size() ? &regions[idx] : nullptr; }
 protected:
-    void callback(std::string_view header, std::vector<Opcode> members) override;
+    void callback(std::string_view header, std::vector<Opcode> members) final;
 private:
     bool hasGlobal { false };
     bool hasControl { false };