diff --git a/src/hsm/cmd_key_domain.c b/src/hsm/cmd_key_domain.c
index a632ac8..d548452 100644
--- a/src/hsm/cmd_key_domain.c
+++ b/src/hsm/cmd_key_domain.c
@@ -103,14 +103,14 @@ int cmd_key_domain() {
         uint8_t t[MAX_KEY_DOMAINS * 2];
         memcpy(t, kdata, tf_kd_size);
         if (p1 == 0x1) {
-            if (t[2 * p2] != 0xff && t[2 * p2 + 1] != 0xff) {
+            if (t[2 * p2] != 0xff || t[2 * p2 + 1] != 0xff) {
                 return SW_INCORRECT_P1P2();
             }
             t[2 * p2] = dkeks = apdu.data[0];
             t[2 * p2 + 1] = current_dkeks = 0;
         }
         else if (p1 == 0x3) {
-            if (t[2 * p2] == 0xff || t[2 * p2 + 1] == 0xff) {
+            if (t[2 * p2] == 0xff && t[2 * p2 + 1] == 0xff) {
                 return SW_INCORRECT_P1P2();
             }
             t[2 * p2] = dkeks = 0xff;