diff --git a/npa/src/npa-tool.c b/npa/src/npa-tool.c
index 7c1fa2e..94bf48f 100644
--- a/npa/src/npa-tool.c
+++ b/npa/src/npa-tool.c
@@ -253,10 +253,10 @@ static int add_to_ASN1_AUXILIARY_DATA(
     }
 
     if (data && data_len) {
-        (*template)->discretionary_data1 = ASN1_OCTET_STRING_new();
-        if (!(*template)->discretionary_data1
+        (*template)->discretionary_data3 = ASN1_OCTET_STRING_new();
+        if (!(*template)->discretionary_data3
                 || !M_ASN1_OCTET_STRING_set(
-                    (*template)->discretionary_data1, data, data_len)) {
+                    (*template)->discretionary_data3, data, data_len)) {
             r = SC_ERROR_INTERNAL;
             goto err;
         }