diff --git a/lib/sig2str.h b/lib/sig2str.h
index bfb207777cc..03d50c94317 100644
--- a/lib/sig2str.h
+++ b/lib/sig2str.h
@@ -17,11 +17,6 @@
 
 /* Written by Paul Eggert.  */
 
-/* This file uses HAVE_* macros.  */
-# if !_GL_CONFIG_H_INCLUDED
-#  error "Please include config.h first."
-# endif
-
 #include <signal.h>
 
 /* Maximum size of a signal name returned by sig2str(), including the