diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 0e5d0fc..bb485b5 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -263,7 +263,6 @@ set(
 	ecdh/ech_err.c
 	ecdh/ech_key.c
 	ecdh/ech_lib.c
-	ecdh/ech_ossl.c
 	ecdsa/ecs_asn1.c
 	ecdsa/ecs_err.c
 	ecdsa/ecs_lib.c