diff --git a/unix/uxplink.c b/unix/uxplink.c
index 7721e4b6..c3a1b8ca 100644
--- a/unix/uxplink.c
+++ b/unix/uxplink.c
@@ -946,6 +946,9 @@ int main(int argc, char **argv)
 	perror("pipe");
 	exit(1);
     }
+    /* We don't want the signal handler to block if the pipe's full. */
+    nonblock(signalpipe[0]);
+    nonblock(signalpipe[1]);
     putty_signal(SIGWINCH, sigwinch);
 
     /*