diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index 007ae67fd..c813a6b4f 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -383,11 +383,11 @@ static epicsThreadOSD *createImplicit(void)
 {
     epicsThreadOSD *pthreadInfo;
     char name[64];
-    int tid;
+    pthread_t tid;
     int status;
 
     tid = pthread_self();
-    sprintf(name, "non-EPICS_%d", tid);
+    sprintf(name, "non-EPICS_%d", (int)tid);
     pthreadInfo = create_threadInfo(name);
     pthreadInfo->tid = tid;
     pthreadInfo->osiPriority = 0;