diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index a1854f146..8d10ccb22 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -469,9 +469,10 @@ epicsThreadId epicsThreadGetIdSelf(void) {
     return(pthreadInfo);
 }
 
-pthread_t epicsThreadGetPthreadIdSelf ( epicsThreadOSD * pthreadInfo )
+pthread_t epicsThreadGetPthreadIdSelf ( epicsThreadPrivateId threadId )
 {
-    return ( pthreadInfo->tid );
+    struct epicsThreadOSD * pThreadInfo = threadId;
+    return pThreadInfo->tid;
 }
 
 epicsThreadId epicsThreadGetId(const char *name) {