diff --git a/compatfd.c b/compatfd.c
index bd377c411a365f9cc8141e42678fd84f424bdadd..41586ceaea969e1eef23c17ec8214a3aa5a3f8ff 100644
--- a/compatfd.c
+++ b/compatfd.c
@@ -29,7 +29,7 @@ static void *sigwait_compat(void *opaque)
     sigset_t all;
 
     sigfillset(&all);
-    sigprocmask(SIG_BLOCK, &all, NULL);
+    pthread_sigmask(SIG_BLOCK, &all, NULL);
 
     while (1) {
         int sig;