diff --git a/crypto/asn1/asn1_par.c b/crypto/asn1/asn1_par.c
index 688eb82718fb6bd95ea29a358f75c4036552d870..aaca69aebd94ca286bac91742f5db55957674109 100644
--- a/crypto/asn1/asn1_par.c
+++ b/crypto/asn1/asn1_par.c
@@ -239,7 +239,7 @@ static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offse
 				ii=d2i_ASN1_BOOLEAN(NULL,&opp,len+hl);
 				if (ii < 0)
 					{
-					if (BIO_write(bp,"Bad boolean\n",12))
+					if (BIO_write(bp,"Bad boolean\n",12) <= 0)
 						goto end;
 					}
 				BIO_printf(bp,":%d",ii);