diff --git a/src/libCom/osi/tsStamp.h b/src/libCom/osi/tsStamp.h
index 342712173..dc1f0441a 100644
--- a/src/libCom/osi/tsStamp.h
+++ b/src/libCom/osi/tsStamp.h
@@ -23,8 +23,10 @@
 extern "C" {
 #endif /* __cplusplus */
 
+#ifndef HP_UX
 struct timespec;
 struct timeval;
+#endif
 
 #define tsStampOK 0
 #define tsStampERROR (-1)