diff --git a/tecs/uselect.c b/tecs/uselect.c
index 4060270..4173a80 100644
--- a/tecs/uselect.c
+++ b/tecs/uselect.c
@@ -1,5 +1,6 @@
 #include <signal.h>
 #include <errno.h>
+#include <stddef.h>
 #include "uselect.h"
 
 /* an uninterruptable version of select. M.Z. Oct 2008 */
@@ -9,10 +10,15 @@ int uselect(int nfds,
   struct timeval *timeout) {
 
   sigset_t sigmask;
-  struct timespec tmo;
-  
-  sigfillset(&sigmask);
-  tmo.tv_sec = timeout->tv_sec;
-  tmo.tv_nsec = timeout->tv_usec * 1000;
-  return pselect(nfds, readfds, writefds, exceptfds, &tmo, &sigmask);
+  struct timespec tmo, *tmoPtr;
+
+  sigfillset(&sigmask);  
+  if (timeout) {
+    tmo.tv_sec = timeout->tv_sec;
+    tmo.tv_nsec = timeout->tv_usec * 1000;
+    tmoPtr = &tmo;
+  } else {
+    tmoPtr = NULL;
+  }
+  return pselect(nfds, readfds, writefds, exceptfds, tmoPtr, &sigmask);
 }