diff --git a/lib/lwres/include/lwres/Makefile.in b/lib/lwres/include/lwres/Makefile.in
index d831a31b91..bb49a5553e 100644
--- a/lib/lwres/include/lwres/Makefile.in
+++ b/lib/lwres/include/lwres/Makefile.in
@@ -41,3 +41,4 @@ install:: installdirs
 	done
 
 distclean::
+	rm -f netdb.h