diff --git a/src/ca/bsd_depen.c b/src/ca/bsd_depen.c
index 128bad7eb..fee296228 100644
--- a/src/ca/bsd_depen.c
+++ b/src/ca/bsd_depen.c
@@ -108,14 +108,21 @@ if(client_lock->recurse>0){
 	taskSuspend(0);
 }
 #endif
-
+#if defined(__hpux)
+        status = select(
+                        maxfd+1,
+                        (int *)&pfdi->readMask,
+                        (int *)&pfdi->writeMask,
+                        (int *)NULL,
+                        ptimeout);
+#else
         status = select(
                         maxfd+1,
                         &pfdi->readMask,
                         &pfdi->writeMask,
                         NULL,
                         ptimeout);
-
+#endif
 #if 0
 printf("leaving select stat=%d errno=%d \n", status, MYERRNO);
 #endif
diff --git a/src/libCom/fdmgr.c b/src/libCom/fdmgr.c
index b7e40ae23..86a4db30f 100644
--- a/src/libCom/fdmgr.c
+++ b/src/libCom/fdmgr.c
@@ -707,12 +707,21 @@ struct timeval 			*ptimeout
 #	ifdef vxWorks 
 		taskSafe();
 #	endif
+#	if defined (__hpux)
+  	status = select(
+			pfdctx->maxfd,
+			(int *)&pfdctx->readch,
+			(int *)&pfdctx->writech,
+			(int *)&pfdctx->excpch,
+			ptimeout);
+#	else
   	status = select(
 			pfdctx->maxfd,
 			&pfdctx->readch,
 			&pfdctx->writech,
 			&pfdctx->excpch,
 			ptimeout);
+#	endif
 #	ifdef vxWorks 
 		taskUnsafe();
 #	endif