diff --git a/src/cas/os/posixRT/osiMutex.h b/src/cas/os/posixRT/osiMutex.h
deleted file mode 100644
index 4623a26c5..000000000
--- a/src/cas/os/posixRT/osiMutex.h
+++ /dev/null
@@ -1,48 +0,0 @@
-//
-// osiMutex - OS independent mutex 
-// (posix RT version)
-//
-
-#include <semaphore.h>
-
-#ifndef assert // allow use of epicsAssert.h
-#include <assert.h>
-#endif
-
-class osiMutex {
-public:
-	//
-	// constructor that returns status
-	// (since g++ does not have exceptions)
-	//
-	caStatus osiMutexInit()
-	{
-		int status;
-		status = sem_init(&this->sem,0,0);		
-		if (status) {
-			return -1;
-		}
-		return 0;
-	}
-	~osiMutex()
-	{
-		int status;
-		status = sem_destroy(&this->sem);		
-		assert(status==0);
-	}
-        void lock() 
-	{
-		int status;
-		status = sem_wait(&this->sem);		
-		assert(status==0);
-	}
-        void unlock() 
-	{
-		int status;
-		status = sem_post(&this->sem);		
-		assert(status==0);
-	}
-private:
-	sem_t	sem;
-};
-