diff --git a/src/libCom/osi/os/posix/osdTime.cpp b/src/libCom/osi/os/posix/osdTime.cpp
index 62c4ba504..7284b9c4c 100644
--- a/src/libCom/osi/os/posix/osdTime.cpp
+++ b/src/libCom/osi/os/posix/osdTime.cpp
@@ -14,10 +14,7 @@
 //
 extern "C" epicsShareFunc int epicsShareAPI tsStampGetCurrent (TS_STAMP *pDest)
 {
-
-// Under HP-UX CLOCK_REALTIME is part of an enum
-
-#   if defined(CLOCK_REALTIME) || (defined(HP_UX) && defined(_INCLUDE_POSIX4_SOURCE))
+#   ifdef _POSIX_TIMERS
         struct timespec ts;
         int status;
     
diff --git a/src/libCom/osi/os/posix/osdTime.h b/src/libCom/osi/os/posix/osdTime.h
index 58642a83a..319652fd9 100644
--- a/src/libCom/osi/os/posix/osdTime.h
+++ b/src/libCom/osi/os/posix/osdTime.h
@@ -10,20 +10,12 @@
 
 #include <unistd.h>
 
-/*
- * "struct timespec" is not in all versions of POSIX 1.
- * 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
+#ifndef _POSIX_TIMERS
 	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 _POSIX_TIMERS */
 
 #endif /* ifndef osdTimeh */