diff --git a/system/nxinit/init.c b/system/nxinit/init.c
index 978b8a63b..cc1f18132 100644
--- a/system/nxinit/init.c
+++ b/system/nxinit/init.c
@@ -154,9 +154,19 @@ int main(int argc, FAR char *argv[])
     };
 
   struct pollfd pfds[nitems(ev)];
+  sigset_t mask;
   size_t i;
   int r;
 
+  sigfillset(&mask);
+  r = sigprocmask(SIG_BLOCK, &mask, NULL);
+  sigemptyset(&mask);
+  if (r < 0)
+    {
+      init_err("sigprocmask failed %d", errno);
+      return r;
+    }
+
 #ifdef CONFIG_USBDEV_TRACE
   usbtrace_enable(TRACE_BITSET);
 #endif
@@ -215,7 +225,7 @@ int main(int argc, FAR char *argv[])
           break;
         }
 
-      r = ppoll(pfds, nitems(pfds), MS2TIMESPEC(&timeout, t), NULL);
+      r = ppoll(pfds, nitems(pfds), MS2TIMESPEC(&timeout, t), &mask);
       if (r < 0 && errno != EINTR)
         {
           init_err("Wait event");