diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
index 55071616e..ab45a84fa 100644
--- a/crypto/pem/pem_lib.c
+++ b/crypto/pem/pem_lib.c
@@ -344,7 +344,7 @@ int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
 
     if (enc != NULL) {
         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
-        if (objstr == NULL) {
+        if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
             PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
             goto err;
         }