diff --git a/crypto/asn1/t_x509.c b/crypto/asn1/t_x509.c
index 7d22e1c0ce..e504d50d50 100644
--- a/crypto/asn1/t_x509.c
+++ b/crypto/asn1/t_x509.c
@@ -370,7 +370,7 @@ int ASN1_GENERALIZEDTIME_print(BIO *bp, const ASN1_GENERALIZEDTIME *tm)
 	d= (v[6]-'0')*10+(v[7]-'0');
 	h= (v[8]-'0')*10+(v[9]-'0');
 	m=  (v[10]-'0')*10+(v[11]-'0');
-	if (i >= 14 &&
+	if (tm->length >= 14 &&
 	    (v[12] >= '0') && (v[12] <= '9') &&
 	    (v[13] >= '0') && (v[13] <= '9'))
 		{
@@ -417,7 +417,7 @@ int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm)
 	d= (v[4]-'0')*10+(v[5]-'0');
 	h= (v[6]-'0')*10+(v[7]-'0');
 	m=  (v[8]-'0')*10+(v[9]-'0');
-	if (i >=12 &&
+	if (tm->length >=12 &&
 	    (v[10] >= '0') && (v[10] <= '9') &&
 	    (v[11] >= '0') && (v[11] <= '9'))
 		s=  (v[10]-'0')*10+(v[11]-'0');