diff --git a/crypto/asn1/asn1_lib.c b/crypto/asn1/asn1_lib.c
index fc5b9d5..9b4e166 100644
--- a/crypto/asn1/asn1_lib.c
+++ b/crypto/asn1/asn1_lib.c
@@ -386,7 +386,7 @@
         else
             len = strlen(data);
     }
-    if ((str->length < len) || (str->data == NULL)) {
+    if ((str->length <= len) || (str->data == NULL)) {
         c = str->data;
         if (c == NULL)
             str->data = OPENSSL_malloc(len + 1);