diff --git a/src/hsm/cmd_list_keys.c b/src/hsm/cmd_list_keys.c
index 7ecb6e6..84a587f 100644
--- a/src/hsm/cmd_list_keys.c
+++ b/src/hsm/cmd_list_keys.c
@@ -16,9 +16,20 @@
  */
 
 #include "sc_hsm.h"
+#include "files.h"
 
 int cmd_list_keys()
 {
+    /* First we send DEV private key */
+    /* Both below conditions should be always TRUE */
+    if (search_by_fid(EF_PRKD_DEV, NULL, SPECIFY_EF)) {
+        res_APDU[res_APDU_size++] = EF_PRKD_DEV >> 8;
+        res_APDU[res_APDU_size++] = EF_PRKD_DEV & 0xff;
+    }
+    if (search_by_fid(EF_KEY_DEV, NULL, SPECIFY_EF)) {
+        res_APDU[res_APDU_size++] = EF_KEY_DEV >> 8;
+        res_APDU[res_APDU_size++] = EF_KEY_DEV & 0xff;
+    }
     //first CC
     for (int i = 0; i < dynamic_files; i++) {
         file_t *f = &dynamic_file[i];