diff --git a/src/libCom/osi/os/posix/osdTime.cpp b/src/libCom/osi/os/posix/osdTime.cpp
index cca141183..62c4ba504 100644
--- a/src/libCom/osi/os/posix/osdTime.cpp
+++ b/src/libCom/osi/os/posix/osdTime.cpp
@@ -14,7 +14,10 @@
 //
 extern "C" epicsShareFunc int epicsShareAPI tsStampGetCurrent (TS_STAMP *pDest)
 {
-#   if defined(CLOCK_REALTIME)
+
+// Under HP-UX CLOCK_REALTIME is part of an enum
+
+#   if defined(CLOCK_REALTIME) || (defined(HP_UX) && defined(_INCLUDE_POSIX4_SOURCE))
         struct timespec ts;
         int status;
     
@@ -22,6 +25,7 @@ extern "C" epicsShareFunc int epicsShareAPI tsStampGetCurrent (TS_STAMP *pDest)
         if (status) {
             return tsStampERROR;
         }
+
         *pDest = osiTime (ts);
         return tsStampOK;
 #   else
diff --git a/src/libCom/osi/os/posix/osdTime.h b/src/libCom/osi/os/posix/osdTime.h
index 53685db6e..58642a83a 100644
--- a/src/libCom/osi/os/posix/osdTime.h
+++ b/src/libCom/osi/os/posix/osdTime.h
@@ -15,12 +15,15 @@
  * Solaris has it at ISO POSIX-1c so we will start from there,
  * but may need to fine tune this
  */
+
+#ifndef HP_UX
 #if _POSIX_VERSION < 199506L
 	struct timespec {
 		time_t tv_sec; /* seconds since some epoch */
 		long tv_nsec; /* nanoseconds within the second */
 	};
 #endif /* if _POSIX_VERSION < 199506L */
+#endif /* ifndef HP_UX */
 
 #endif /* ifndef osdTimeh */