diff --git a/modules/caddytls/cf.go b/modules/caddytls/cf.go
new file mode 100644
index 00000000000..0319e3073a0
--- /dev/null
+++ b/modules/caddytls/cf.go
@@ -0,0 +1,10 @@
+//go:build cfgo
+package caddytls
+
+import (
+	"crypto/tls"
+)
+
+func init() {
+	SupportedCurves["X25519Kyber768Draft00"] = tls.X25519Kyber768Draft00
+}