diff --git a/readline/ChangeLog b/readline/ChangeLog
index 4961f999f1..2f89aad7c8 100644
--- a/readline/ChangeLog
+++ b/readline/ChangeLog
@@ -1,3 +1,8 @@
+2021-03-02  Tom Tromey  <tom@tromey.com>
+
+	* readline/signals.c (_rl_handle_signal): Add missing check for
+	HAVE_POSIX_SIGNALS.
+
 2021-03-02  Tom Tromey  <tom@tromey.com>
 
 	* Import readline 8.1.
diff --git a/readline/readline/signals.c b/readline/readline/signals.c
index f9174ab8a0..8fedc370a1 100644
--- a/readline/readline/signals.c
+++ b/readline/readline/signals.c
@@ -266,8 +266,10 @@ _rl_handle_signal (int sig)
     case SIGQUIT:
 #endif
 
+#if defined (HAVE_POSIX_SIGNALS)
       if (block_sig)
 	sigprocmask (SIG_BLOCK, &set, &oset);
+#endif
 
       rl_echo_signal_char (sig);
       rl_cleanup_after_signal ();