diff --git a/lib/dns/openssl_shim.h b/lib/dns/openssl_shim.h
index 439d9f999a..e716b3a7a3 100644
--- a/lib/dns/openssl_shim.h
+++ b/lib/dns/openssl_shim.h
@@ -72,8 +72,6 @@ DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
 
 int
 DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
-
-#define DH_clear_flags(d, f) ((d)->flags &= ~(f))
 #endif /* !HAVE_DH_GET0_KEY */
 
 #if !HAVE_ERR_GET_ERROR_ALL
diff --git a/lib/dns/openssldh_link.c b/lib/dns/openssldh_link.c
index 0a2e11f51f..e76cfbe310 100644
--- a/lib/dns/openssldh_link.c
+++ b/lib/dns/openssldh_link.c
@@ -492,7 +492,6 @@ openssldh_generate(dst_key_t *key, int generator, void (*callback)(int)) {
 		DST_RET(dst__openssl_toresult2("DH_generate_key",
 					       DST_R_OPENSSLFAILURE));
 	}
-	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
 	key->keydata.dh = dh;
 	dh = NULL;
 #else
@@ -785,7 +784,6 @@ openssldh_fromdns(dst_key_t *key, isc_buffer_t *data) {
 	if (dh == NULL) {
 		DST_RET(dst__openssl_toresult(ISC_R_NOMEMORY));
 	}
-	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
 #else
 	bld = OSSL_PARAM_BLD_new();
 	if (bld == NULL) {
@@ -1116,7 +1114,6 @@ openssldh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
 	if (dh == NULL) {
 		DST_RET(ISC_R_NOMEMORY);
 	}
-	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
 #else
 	bld = OSSL_PARAM_BLD_new();
 	if (bld == NULL) {