diff --git a/tool/yubico-piv-tool.c b/tool/yubico-piv-tool.c
index c244a37..0a93044 100644
--- a/tool/yubico-piv-tool.c
+++ b/tool/yubico-piv-tool.c
@@ -557,7 +557,7 @@ static bool import_cert(ykpiv_state *state, enum enum_key_format cert_format,
     int object = get_object_id(slot);
     ykpiv_rc res;
 
-    if(4 + cert_len + 5 > 3072) { /* 4 is prefix size, 5 is postfix size */
+    if(4 + cert_len + 5 > sizeof(certdata)) { /* 4 is prefix size, 5 is postfix size */
       fprintf(stderr, "Certificate is to large to fit in buffer.\n");
       goto import_cert_out;
     }