diff --git a/glslang/OSDependent/Unix/ossource.cpp b/glslang/OSDependent/Unix/ossource.cpp
index 81da99c2..b98df934 100644
--- a/glslang/OSDependent/Unix/ossource.cpp
+++ b/glslang/OSDependent/Unix/ossource.cpp
@@ -56,52 +56,6 @@ namespace glslang {
 // Thread cleanup
 //
 
-//
-// Wrapper for Linux call to DetachThread.  This is required as pthread_cleanup_push() expects
-// the cleanup routine to return void.
-//
-static void DetachThreadLinux(void *)
-{
-    DetachThread();
-}
-
-//
-// Registers cleanup handler, sets cancel type and state, and executes the thread specific
-// cleanup handler.  This function will be called in the Standalone.cpp for regression
-// testing.  When OpenGL applications are run with the driver code, Linux OS does the
-// thread cleanup.
-//
-void OS_CleanupThreadData(void)
-{
-#if defined(__ANDROID__) || defined(__Fuchsia__)
-    DetachThreadLinux(NULL);
-#else
-    int old_cancel_state, old_cancel_type;
-    void *cleanupArg = NULL;
-
-    //
-    // Set thread cancel state and push cleanup handler.
-    //
-    pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancel_state);
-    pthread_cleanup_push(DetachThreadLinux, (void *) cleanupArg);
-
-    //
-    // Put the thread in deferred cancellation mode.
-    //
-    pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &old_cancel_type);
-
-    //
-    // Pop cleanup handler and execute it prior to unregistering the cleanup handler.
-    //
-    pthread_cleanup_pop(1);
-
-    //
-    // Restore the thread's previous cancellation mode.
-    //
-    pthread_setcanceltype(old_cancel_state, NULL);
-#endif
-}
-
 //
 // Thread Local Storage Operations
 //
diff --git a/glslang/OSDependent/osinclude.h b/glslang/OSDependent/osinclude.h
index 218abe4f..fcfeff2c 100644
--- a/glslang/OSDependent/osinclude.h
+++ b/glslang/OSDependent/osinclude.h
@@ -54,8 +54,6 @@ void ReleaseGlobalLock();
 
 typedef unsigned int (*TThreadEntrypoint)(void*);
 
-void OS_CleanupThreadData(void);
-
 void OS_DumpMemoryCounters();
 
 } // end namespace glslang