diff --git a/crypto/dh/dh_lib.c b/crypto/dh/dh_lib.c
index e6eba34ac9..6280472ade 100644
--- a/crypto/dh/dh_lib.c
+++ b/crypto/dh/dh_lib.c
@@ -243,6 +243,7 @@ long DH_get_length(const DH *dh)
 int DH_set_length(DH *dh, long length)
 {
     dh->length = length;
+    dh->dirty_cnt++;
     return 1;
 }