diff --git a/src/syncterm/telnets.c b/src/syncterm/telnets.c
index 875f5d85c14c2091099fc6a487eb62cb2e7f6cc6..5cf741a21226d8f33254395cbf27901562b4a9da 100644
--- a/src/syncterm/telnets.c
+++ b/src/syncterm/telnets.c
@@ -4,6 +4,7 @@
 #if defined(__STDC_NO_ATOMICS__)
 #error Support for stdatomic.h is required.
 #endif
+#endif
 
 #include <stdatomic.h>
 #include <stdlib.h>