diff --git a/src/syncterm/telnets.c b/src/syncterm/telnets.c
index e870008b40b5aa3662a90bf7ffc2a30bbce6d90d..69288a0ce2451bfc96638c42b4f3c4c3b6676249 100644
--- a/src/syncterm/telnets.c
+++ b/src/syncterm/telnets.c
@@ -1,6 +1,6 @@
 /* Copyright (C), 2007 by Stephen Hurd */
 
-#if defined(__STDC_NO_ATOMICS__) && (__STDC_NO_ATOMICS__)
+#if defined(__STDC_NO_ATOMICS__)
 #error Support for stdatomic.h is required.
 #endif