diff --git a/Applications/QuickLookGenerator/src/generate.mm b/Applications/QuickLookGenerator/src/generate.mm
index eb4a1229..927e60eb 100644
--- a/Applications/QuickLookGenerator/src/generate.mm
+++ b/Applications/QuickLookGenerator/src/generate.mm
@@ -15,8 +15,6 @@
 
 OAK_EXTERN_C_BEGIN
 
-static plist::dictionary_t prune_dictionary (plist::dictionary_t const& plist) { return plist; }
-
 static void initialize (CFBundleRef generatorBundle)
 {
 	static dispatch_once_t onceToken;
@@ -35,7 +33,7 @@ static void initialize (CFBundleRef generatorBundle)
 			paths.push_back(path::join(path, "Bundles"));
 
 		plist::cache_t cache;
-		cache.load(path::join(path::home(), "Library/Caches/com.macromates.TextMate/BundlesIndex.plist"), &prune_dictionary);
+		cache.load(path::join(path::home(), "Library/Caches/com.macromates.TextMate/BundlesIndex.plist"));
 
 		auto index = create_bundle_index(paths, cache);
 		bundles::set_index(index.first, index.second);
diff --git a/Frameworks/plist/src/fs_cache.cc b/Frameworks/plist/src/fs_cache.cc
index 26ab568c..ef2bb208 100644
--- a/Frameworks/plist/src/fs_cache.cc
+++ b/Frameworks/plist/src/fs_cache.cc
@@ -23,13 +23,15 @@ static std::string read_link (std::string const& path)
 	return NULL_STR;
 }
 
+static plist::dictionary_t dictionary_identity_function (plist::dictionary_t const& plist) { return plist; }
+
 namespace plist
 {
 	int32_t const cache_t::kPropertyCacheFormatVersion = 2;
 
 	void cache_t::load (std::string const& path, plist::dictionary_t (*prune_dictionary)(plist::dictionary_t const&))
 	{
-		_prune_dictionary = prune_dictionary;
+		_prune_dictionary = prune_dictionary ?: dictionary_identity_function;
 
 		int32_t version;
 		auto plist = plist::load(path);
diff --git a/Frameworks/plist/src/fs_cache.h b/Frameworks/plist/src/fs_cache.h
index ad8959ca..2148841e 100644
--- a/Frameworks/plist/src/fs_cache.h
+++ b/Frameworks/plist/src/fs_cache.h
@@ -8,7 +8,7 @@ namespace plist
 {
 	struct PUBLIC cache_t
 	{
-		void load (std::string const& path, plist::dictionary_t (*prune_dictionary)(plist::dictionary_t const&));
+		void load (std::string const& path, plist::dictionary_t (*prune_dictionary)(plist::dictionary_t const&) = NULL);
 		void save (std::string const& path) const;
 
 		bool dirty () const        { return _dirty; }