diff --git a/src/makefiles/config/config.h.in b/src/makefiles/config/config.h.in
index 95eea46076..7290c6e669 100644
--- a/src/makefiles/config/config.h.in
+++ b/src/makefiles/config/config.h.in
@@ -15,6 +15,7 @@
 #undef HAVE_VARARGS_H
 #undef HAVE_STDARG_H
 #undef HAVE_STRING_H
+#undef HAVE_SIGNAL_H
 
 
 /* Is the platform big endian? */