diff --git a/source/base/StarAssets.cpp b/source/base/StarAssets.cpp
index 7475a04..1519e86 100644
--- a/source/base/StarAssets.cpp
+++ b/source/base/StarAssets.cpp
@@ -371,7 +371,7 @@ StringList Assets::scan(String const& suffix) const {
 StringList Assets::scan(String const& prefix, String const& suffix) const {
   StringList result;
   if (suffix.beginsWith(".") && !suffix.substr(1).hasChar('.')) {
-    StringSet filesWithExtension = scanExtension(suffix);
+    auto& filesWithExtension = scanExtension(suffix);
     for (auto const& file : filesWithExtension) {
       if (file.beginsWith(prefix, String::CaseInsensitive))
         result.append(file);
@@ -386,11 +386,11 @@ StringList Assets::scan(String const& prefix, String const& suffix) const {
   return result;
 }
 
-const StringSet NullStringSet;
+const CaseInsensitiveStringSet NullExtensionScan;
 
-StringSet const& Assets::scanExtension(String const& extension) const {
+CaseInsensitiveStringSet const& Assets::scanExtension(String const& extension) const {
   auto find = m_filesByExtension.find(extension.beginsWith(".") ? extension.substr(1) : extension);
-  return find != m_filesByExtension.end() ? find->second : NullStringSet;
+  return find != m_filesByExtension.end() ? find->second : NullExtensionScan;
 }
 
 Json Assets::json(String const& path) const {
@@ -416,7 +416,7 @@ void Assets::queueJsons(StringList const& paths) const {
   }));
 }
 
-void Assets::queueJsons(StringSet const& paths) const {
+void Assets::queueJsons(CaseInsensitiveStringSet const& paths) const {
   MutexLocker assetsLocker(m_assetsMutex);
   for (String const& path : paths) {
     auto components = AssetPath::split(path);
@@ -439,7 +439,7 @@ void Assets::queueImages(StringList const& paths) const {
   }));
 }
 
-void Assets::queueImages(StringSet const& paths) const {
+void Assets::queueImages(CaseInsensitiveStringSet const& paths) const {
   MutexLocker assetsLocker(m_assetsMutex);
   for (String const& path : paths) {
     auto components = AssetPath::split(path);
@@ -482,7 +482,7 @@ void Assets::queueAudios(StringList const& paths) const {
   }));
 }
 
-void Assets::queueAudios(StringSet const& paths) const {
+void Assets::queueAudios(CaseInsensitiveStringSet const& paths) const {
   MutexLocker assetsLocker(m_assetsMutex);
   for (String const& path : paths) {
     auto components = AssetPath::split(path);
diff --git a/source/base/StarAssets.hpp b/source/base/StarAssets.hpp
index 54cbb2f..6b454e8 100644
--- a/source/base/StarAssets.hpp
+++ b/source/base/StarAssets.hpp
@@ -190,7 +190,7 @@ public:
   // Scans all assets for files with the given extension, which is specially
   // indexed and much faster than a normal scan.  Extension may contain leading
   // '.' character or it may be omitted.
-  StringSet const& scanExtension(String const& extension) const;
+  CaseInsensitiveStringSet const& scanExtension(String const& extension) const;
 
   // Get json asset with an optional sub-path.  The sub-path portion of the
   // path refers to a key in the top-level object, and may use dot notation
@@ -204,7 +204,7 @@ public:
 
   // Load all the given jsons using background processing.
   void queueJsons(StringList const& paths) const;
-  void queueJsons(StringSet const& paths) const;
+  void queueJsons(CaseInsensitiveStringSet const& paths) const;
 
   // Returns *either* an image asset or a sub-frame.  Frame files are JSON
   // descriptor files that reference a particular image and label separate
@@ -216,7 +216,7 @@ public:
   ImageConstPtr image(AssetPath const& path) const;
   // Load images using background processing
   void queueImages(StringList const& paths) const;
-  void queueImages(StringSet const& paths) const;
+  void queueImages(CaseInsensitiveStringSet const& paths) const;
   // Return the given image *if* it is already loaded, otherwise queue it for
   // loading.
   ImageConstPtr tryImage(AssetPath const& path) const;
@@ -231,7 +231,7 @@ public:
   AudioConstPtr audio(String const& path) const;
   // Load audios using background processing
   void queueAudios(StringList const& paths) const;
-  void queueAudios(StringSet const& paths) const;
+  void queueAudios(CaseInsensitiveStringSet const& paths) const;
   // Return the given audio *if* it is already loaded, otherwise queue it for
   // loading.
   AudioConstPtr tryAudio(String const& path) const;
@@ -331,7 +331,7 @@ private:
   // Maps the source asset name to the source containing it
   CaseInsensitiveStringMap<AssetFileDescriptor> m_files;
   // Maps an extension to the files with that extension
-  CaseInsensitiveStringMap<StringSet> m_filesByExtension;
+  CaseInsensitiveStringMap<CaseInsensitiveStringSet> m_filesByExtension;
 
   ByteArray m_digest;
 
diff --git a/source/core/StarString.hpp b/source/core/StarString.hpp
index 9c18515..2280fb6 100644
--- a/source/core/StarString.hpp
+++ b/source/core/StarString.hpp
@@ -359,6 +359,8 @@ struct CaseInsensitiveStringCompare {
 
 typedef HashSet<String> StringSet;
 
+typedef HashSet<String, CaseInsensitiveStringHash, CaseInsensitiveStringCompare> CaseInsensitiveStringSet;
+
 template <typename MappedT, typename HashT = hash<String>, typename ComparatorT = std::equal_to<String>>
 using StringMap = HashMap<String, MappedT, HashT, ComparatorT>;