diff --git a/lib/isc/include/isc/netmgr.h b/lib/isc/include/isc/netmgr.h
index c01d3e2225..7391021179 100644
--- a/lib/isc/include/isc/netmgr.h
+++ b/lib/isc/include/isc/netmgr.h
@@ -11,8 +11,6 @@
 
 #pragma once
 
-#include <config.h>
-
 #include <isc/mem.h>
 #include <isc/result.h>
 #include <isc/types.h>