diff --git a/src/libCom/osi/os/RTEMS/osdEvent.c b/src/libCom/osi/os/RTEMS/osdEvent.c
index 032f1d402..da60a488e 100644
--- a/src/libCom/osi/os/RTEMS/osdEvent.c
+++ b/src/libCom/osi/os/RTEMS/osdEvent.c
@@ -149,7 +149,7 @@ epicsEventWaitWithTimeout(epicsEventId id, double timeOut)
     sc = rtems_semaphore_obtain (sid, wait, delay);
     if (sc == RTEMS_SUCCESSFUL)
         return epicsEventWaitOK;
-    else if (sc == RTEMS_TIMEOUT)
+    else if ((sc == RTEMS_TIMEOUT) || (sc == RTEMS_UNSATISFIED))
         return epicsEventWaitTimeout;
     else
         return epicsEventWaitError;