diff --git a/src/kex.c b/src/kex.c
index 73128ce1..590b30ab 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -1711,7 +1711,6 @@ static const LIBSSH2_KEX_METHOD *libssh2_kex_methods[] = {
     &kex_method_diffie_helman_group_exchange_sha256,
     &kex_method_diffie_helman_group_exchange_sha1,
     &kex_method_diffie_helman_group14_sha1,
-    &kex_method_diffie_helman_group_exchange_sha1,
     &kex_method_diffie_helman_group1_sha1,
     NULL
 };