diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index eca3734b0..fc15b8a51 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -395,8 +395,11 @@
 /* Define to 1 if you have the <libgen.h> header file. */
 #cmakedefine HAVE_LIBGEN_H 1
 
-/* Define to 1 if you have the `idn' library (-lidn). */
-#cmakedefine HAVE_LIBIDN 1
+/* Define to 1 if you have the `idn2' library (-lidn2). */
+#cmakedefine HAVE_LIBIDN2 1
+
+/* Define to 1 if you have the idn2.h header file. */
+#cmakedefine HAVE_IDN2_H 1
 
 /* Define to 1 if you have the `resolv' library (-lresolv). */
 #cmakedefine HAVE_LIBRESOLV 1