diff --git a/scd/app-common.h b/scd/app-common.h
index e862753cf..f16c24087 100644
--- a/scd/app-common.h
+++ b/scd/app-common.h
@@ -38,6 +38,7 @@
 
 /* Flags used with app_readkey.  */
 #define APP_READKEY_FLAG_INFO    1  /* Send also a KEYPAIRINFO line.  */
+#define APP_READKEY_FLAG_ADVANCED 2 /* (gnupg 2.2 only)  */
 
 /* Bit flags set by the decipher function into R_INFO.  */
 #define APP_DECIPHER_INFO_NOPAD  1  /* Padding has been removed.  */
@@ -121,7 +122,7 @@ struct app_ctx_s {
     gpg_error_t (*readcert) (app_t app, const char *certid,
                      unsigned char **cert, size_t *certlen);
     gpg_error_t (*readkey) (app_t app, ctrl_t ctrl,
-                            int advanced, const char *certid,
+                            const char *certid, unsigned int flags,
                             unsigned char **pk, size_t *pklen);
     gpg_error_t (*getattr) (app_t app, ctrl_t ctrl, const char *name);
     gpg_error_t (*setattr) (app_t app, ctrl_t ctrl, const char *name,
diff --git a/scd/app-nks.c b/scd/app-nks.c
index 451ff8f01..3cbf1e414 100644
--- a/scd/app-nks.c
+++ b/scd/app-nks.c
@@ -608,7 +608,7 @@ do_readcert (app_t app, const char *certid,
    certificate parsing code in commands.c:cmd_readkey.  For internal
    use PK and PKLEN may be NULL to just check for an existing key.  */
 static gpg_error_t
-do_readkey (app_t app, ctrl_t ctrl, int advanced, const char *keyid,
+do_readkey (app_t app, ctrl_t ctrl, const char *keyid, unsigned int flags,
             unsigned char **pk, size_t *pklen)
 {
   gpg_error_t err;
@@ -618,7 +618,7 @@ do_readkey (app_t app, ctrl_t ctrl, int advanced, const char *keyid,
 
   (void)ctrl;
 
-  if (advanced)
+  if ((flags & APP_READKEY_FLAG_ADVANCED))
     return GPG_ERR_NOT_SUPPORTED;
 
   /* We use a generic name to retrieve PK.AUT.IFD-SPK.  */
@@ -693,7 +693,7 @@ do_writekey (app_t app, ctrl_t ctrl,
   else
     return gpg_error (GPG_ERR_INV_ID);
 
-  if (!force && !do_readkey (app, ctrl, 0, keyid, NULL, NULL))
+  if (!force && !do_readkey (app, ctrl, keyid, 0, NULL, NULL))
     return gpg_error (GPG_ERR_EEXIST);
 
   /* Parse the S-expression.  */
diff --git a/scd/app-openpgp.c b/scd/app-openpgp.c
index b1121723b..5a7361f73 100644
--- a/scd/app-openpgp.c
+++ b/scd/app-openpgp.c
@@ -1977,7 +1977,7 @@ do_learn_status (app_t app, ctrl_t ctrl, unsigned int flags)
    buffer. On error PK and PKLEN are not changed and an error code is
    returned.  */
 static gpg_error_t
-do_readkey (app_t app, ctrl_t ctrl, int advanced, const char *keyid,
+do_readkey (app_t app, ctrl_t ctrl, const char *keyid, unsigned int flags,
             unsigned char **pk, size_t *pklen)
 {
   gpg_error_t err;
@@ -2003,7 +2003,7 @@ do_readkey (app_t app, ctrl_t ctrl, int advanced, const char *keyid,
   if (!buf)
     return gpg_error (GPG_ERR_NO_PUBKEY);
 
-  if (advanced)
+  if ((flags & APP_READKEY_FLAG_ADVANCED))
     {
       gcry_sexp_t s_key;
 
diff --git a/scd/app.c b/scd/app.c
index ba8db10af..b1bc35f53 100644
--- a/scd/app.c
+++ b/scd/app.c
@@ -865,7 +865,9 @@ app_readkey (app_t app, ctrl_t ctrl, int advanced, const char *keyid,
   err = lock_app (app, ctrl);
   if (err)
     return err;
-  err= app->fnc.readkey (app, ctrl, advanced, keyid, pk, pklen);
+  err= app->fnc.readkey (app, ctrl, keyid,
+                         advanced? APP_READKEY_FLAG_ADVANCED : 0,
+                         pk, pklen);
   unlock_app (app);
   return err;
 }