diff --git a/stepmania/src/arch/Threads/Threads.h b/stepmania/src/arch/Threads/Threads.h
index 518724c7e9..60b07c6228 100644
--- a/stepmania/src/arch/Threads/Threads.h
+++ b/stepmania/src/arch/Threads/Threads.h
@@ -49,10 +49,6 @@ public:
 	/* Unlock the mutex.  This must only be called when the mutex is locked; implementations
 	 * may fail with an assertion if the mutex is not locked. */
 	virtual void Unlock() = 0;
-
-	/* Return the thread ID of the thread that has this mutex locked.  If no thread
-	 * holds the mutex, return GetInvalidThreadId. */
-	virtual uint64_t GetLockedByThreadId() const = 0;
 };
 
 /* These functions must be implemented by the thread implementation. */
diff --git a/stepmania/src/arch/Threads/Threads_Pthreads.cpp b/stepmania/src/arch/Threads/Threads_Pthreads.cpp
index 7b64fb0da3..6dca201eba 100644
--- a/stepmania/src/arch/Threads/Threads_Pthreads.cpp
+++ b/stepmania/src/arch/Threads/Threads_Pthreads.cpp
@@ -114,8 +114,6 @@ MutexImpl_Pthreads::MutexImpl_Pthreads( RageMutex *pParent ):
 	MutexImpl( pParent )
 {
 	pthread_mutex_init( &mutex, NULL );
-	LockedBy = GetInvalidThreadId();
-	LockCnt = 0;
 }
 
 MutexImpl_Pthreads::~MutexImpl_Pthreads()
@@ -128,12 +126,6 @@ MutexImpl_Pthreads::~MutexImpl_Pthreads()
 
 bool MutexImpl_Pthreads::Lock()
 {
-	if( LockedBy == (uint64_t) GetThisThreadId() )
-	{
-		++LockCnt;
-		return true;
-	}
-
 #if defined(HAVE_PTHREAD_MUTEX_TIMEDLOCK) && defined(CRASH_HANDLER)
 	int len = 10; /* seconds */
 	int tries = 2;
@@ -151,7 +143,6 @@ bool MutexImpl_Pthreads::Lock()
 		switch( ret )
 		{
 		case 0:
-			LockedBy = GetCurrentThreadId();
 			return true;
 
 		case ETIMEDOUT:
@@ -171,7 +162,6 @@ bool MutexImpl_Pthreads::Lock()
 	int ret = pthread_mutex_lock( &mutex );
 	if( ret )
 		RageException::Throw( "pthread_mutex_lock failed: %s", strerror(ret) );
-	LockedBy = GetThisThreadId();
 	return true;
 #endif
 }
@@ -179,21 +169,9 @@ bool MutexImpl_Pthreads::Lock()
 
 void MutexImpl_Pthreads::Unlock()
 {
-	if( LockCnt )
-	{
-		--LockCnt;
-		return;
-	}
-
-	LockedBy = GetInvalidThreadId();
 	pthread_mutex_unlock( &mutex );
 }
 
-uint64_t MutexImpl_Pthreads::GetLockedByThreadId() const
-{
-	return LockedBy;
-}
-
 uint64_t GetThisThreadId()
 {
 #if defined(PID_BASED_THREADS)
diff --git a/stepmania/src/arch/Threads/Threads_Pthreads.h b/stepmania/src/arch/Threads/Threads_Pthreads.h
index d0ed136d09..6ba8f75d23 100644
--- a/stepmania/src/arch/Threads/Threads_Pthreads.h
+++ b/stepmania/src/arch/Threads/Threads_Pthreads.h
@@ -38,9 +38,6 @@ public:
 
 struct MutexImpl_Pthreads: public MutexImpl
 {
-	uint64_t LockedBy;
-	volatile int LockCnt;
-
 	pthread_mutex_t mutex;
 
 	MutexImpl_Pthreads( RageMutex *parent );
@@ -48,7 +45,6 @@ struct MutexImpl_Pthreads: public MutexImpl
 
 	bool Lock();
 	void Unlock();
-	uint64_t GetLockedByThreadId() const;
 };
 
 #endif
diff --git a/stepmania/src/arch/Threads/Threads_Win32.cpp b/stepmania/src/arch/Threads/Threads_Win32.cpp
index 87654348db..aae90b68ef 100644
--- a/stepmania/src/arch/Threads/Threads_Win32.cpp
+++ b/stepmania/src/arch/Threads/Threads_Win32.cpp
@@ -87,8 +87,6 @@ MutexImpl_Win32::MutexImpl_Win32( RageMutex *pParent ):
 {
 	mutex = CreateMutex( NULL, false, NULL );
 	ASSERT_M( mutex != NULL, werr_ssprintf(GetLastError(), "CreateMutex") );
-	LockedBy = GetInvalidThreadId();
-	LockCnt = 0;
 }
 
 MutexImpl_Win32::~MutexImpl_Win32()
@@ -98,12 +96,6 @@ MutexImpl_Win32::~MutexImpl_Win32()
 
 bool MutexImpl_Win32::Lock()
 {
-	if( LockedBy == GetCurrentThreadId() )
-	{
-		++LockCnt;
-		return true;
-	}
-
 	int len = 15000;
 	int tries = 2;
 
@@ -120,7 +112,6 @@ bool MutexImpl_Win32::Lock()
 			break;
 
 		case WAIT_OBJECT_0:
-			LockedBy = GetCurrentThreadId();
 			return true;
 
 		case WAIT_TIMEOUT:
@@ -140,13 +131,6 @@ bool MutexImpl_Win32::Lock()
 
 void MutexImpl_Win32::Unlock()
 {
-	if( LockCnt )
-	{
-		--LockCnt;
-		return;
-	}
-
-	LockedBy = GetInvalidThreadId();
 	const bool ret = !!ReleaseMutex( mutex );
 
 	/* We can't ASSERT here, since this is called from checkpoints, which is
@@ -155,11 +139,6 @@ void MutexImpl_Win32::Unlock()
 		sm_crash( werr_ssprintf( GetLastError(), "ReleaseMutex failed" ) );
 }
 
-uint64_t MutexImpl_Win32::GetLockedByThreadId() const
-{
-	return LockedBy;
-}
-
 uint64_t GetThisThreadId()
 {
 	return GetCurrentThreadId();
diff --git a/stepmania/src/arch/Threads/Threads_Win32.h b/stepmania/src/arch/Threads/Threads_Win32.h
index 557c553ff5..3e1d6975c8 100644
--- a/stepmania/src/arch/Threads/Threads_Win32.h
+++ b/stepmania/src/arch/Threads/Threads_Win32.h
@@ -22,9 +22,6 @@ public:
 
 struct MutexImpl_Win32: public MutexImpl
 {
-	uint64_t LockedBy;
-	volatile int LockCnt;
-
 	HANDLE mutex;
 
 	MutexImpl_Win32( RageMutex *parent );
@@ -32,7 +29,6 @@ struct MutexImpl_Win32: public MutexImpl
 
 	bool Lock();
 	void Unlock();
-	uint64_t GetLockedByThreadId() const;
 };
 
 #endif