diff --git a/libraries/music_common/fileio.h b/libraries/music_common/fileio.h
index 1a26f2db4..0c592a3da 100644
--- a/libraries/music_common/fileio.h
+++ b/libraries/music_common/fileio.h
@@ -224,8 +224,8 @@ struct VectorReader : public MemoryReader
 
 //==========================================================================
 //
-// The follpwing two functions are needed to allow using UTF-8 in the file interface.
-// fopen on Windows is only safe for ASCII,
+// The following two functions are needed to allow using UTF-8 in the file interface.
+// fopen on Windows is only safe for ASCII.
 //
 //==========================================================================
 
@@ -271,10 +271,12 @@ inline bool fileExists(const char *fn)
 
 class SoundFontReaderInterface
 {
-public:
+protected:
 	virtual ~SoundFontReaderInterface() {}
+public:
 	virtual struct FileInterface* open_file(const char* fn) = 0;
 	virtual void add_search_path(const char* path) = 0;
+	virtual void close() { delete this; }
 };
 
 
diff --git a/libraries/timidity/instrum.cpp b/libraries/timidity/instrum.cpp
index bd6224cc4..9240de456 100644
--- a/libraries/timidity/instrum.cpp
+++ b/libraries/timidity/instrum.cpp
@@ -703,7 +703,7 @@ Instruments::~Instruments()
 			drumset[i] = NULL;
 		}
 	}
-	if (sfreader != nullptr) delete sfreader;
+	if (sfreader != nullptr) sfreader->close();
 	sfreader = nullptr;
 }
 
diff --git a/libraries/timidityplus/instrum.cpp b/libraries/timidityplus/instrum.cpp
index b133af280..431147dcf 100644
--- a/libraries/timidityplus/instrum.cpp
+++ b/libraries/timidityplus/instrum.cpp
@@ -73,7 +73,7 @@ Instruments::~Instruments()
 	free_tone_bank();
 	free_instrument_map();
 
-	if (sfreader != nullptr) delete sfreader;
+	if (sfreader != nullptr) sfreader->close();
 }
 
 void Instruments::free_instrument(Instrument *ip)
diff --git a/libraries/wildmidi/wildmidi_lib.cpp b/libraries/wildmidi/wildmidi_lib.cpp
index 3401e997a..9286b9825 100644
--- a/libraries/wildmidi/wildmidi_lib.cpp
+++ b/libraries/wildmidi/wildmidi_lib.cpp
@@ -1326,7 +1326,7 @@ void Instruments::load_patch(struct _mdi *mdi, unsigned short patchid)
 Instruments::~Instruments()
 {
 	FreePatches();
-	delete sfreader;
+	sfreader->close();
 }