diff --git a/sm/call-agent.c b/sm/call-agent.c
index a0211fc41..dfaeee61a 100644
--- a/sm/call-agent.c
+++ b/sm/call-agent.c
@@ -1028,6 +1028,9 @@ gpgsm_agent_istrusted (ctrl_t ctrl, ksba_cert_t cert, const char *hexfpr,
     }
 
   /* First try to get the info from the cache.  */
+  if ((opt.compat_flags & COMPAT_NO_KEYINFO_CACHE))
+    istrusted_cache_disabled = 1;
+
   if (!istrusted_cache_disabled && !istrusted_cache_valid)
     {
       /* Cache is empty - fill it.  */
@@ -1462,6 +1465,9 @@ gpgsm_agent_keyinfo (ctrl_t ctrl, const char *hexkeygrip, char **r_serialno)
     return gpg_error (GPG_ERR_INV_VALUE);
 
   /* First try to fill the cache.  */
+  if ((opt.compat_flags & COMPAT_NO_KEYINFO_CACHE))
+    keyinfo_cache_disabled = 1;
+
   if (!keyinfo_cache_disabled && !ctrl->keyinfo_cache_valid)
     {
       parm.fill_mode = 1;
diff --git a/sm/gpgsm.c b/sm/gpgsm.c
index c108da58c..26b05773c 100644
--- a/sm/gpgsm.c
+++ b/sm/gpgsm.c
@@ -501,6 +501,7 @@ static struct compatibility_flags_s compatibility_flags [] =
   {
     { COMPAT_ALLOW_KA_TO_ENCR, "allow-ka-to-encr" },
     { COMPAT_NO_CHAIN_CACHE, "no-chain-cache"     },
+    { COMPAT_NO_KEYINFO_CACHE, "no-keyinfo-cache" },
     { 0, NULL }
   };
 
diff --git a/sm/gpgsm.h b/sm/gpgsm.h
index 142e7bb94..916d0235c 100644
--- a/sm/gpgsm.h
+++ b/sm/gpgsm.h
@@ -223,6 +223,8 @@ struct
 /* Not actually a compatibiliy flag but useful to limit the
  * required memory for a validated key listing.  */
 #define COMPAT_NO_CHAIN_CACHE     2
+/* Ditto.  But here to disable the keyinfo and istrusted cache.  */
+#define COMPAT_NO_KEYINFO_CACHE   4
 
 /* Forward declaration for an object defined in server.c */
 struct server_local_s;