diff --git a/src/gpg_data.c b/src/gpg_data.c
index d32d49b..fe6fc37 100644
--- a/src/gpg_data.c
+++ b/src/gpg_data.c
@@ -407,10 +407,6 @@ int gpg_apdu_put_data(unsigned int ref) {
                 rsa_pub = (cx_rsa_public_key_t *) &G_gpg_vstate.work.rsa.public;
                 rsa_priv = (cx_rsa_private_key_t *) &G_gpg_vstate.work.rsa.private;
                 switch (ksz) {
-                    case 1024 / 8:
-                        pkey_size = sizeof(cx_rsa_1024_private_key_t);
-                        pq = G_gpg_vstate.work.rsa.public1024.n;
-                        break;
                     case 2048 / 8:
                         pkey_size = sizeof(cx_rsa_2048_private_key_t);
                         pq = G_gpg_vstate.work.rsa.public2048.n;
diff --git a/src/gpg_gen.c b/src/gpg_gen.c
index ec96dc5..17f4864 100644
--- a/src/gpg_gen.c
+++ b/src/gpg_gen.c
@@ -87,9 +87,6 @@ static int gpg_gen_rsa_kyey(gpg_key_t *keygpg, uint8_t *name) {
     rsa_pub = (cx_rsa_public_key_t *) &G_gpg_vstate.work.rsa.public;
     rsa_priv = (cx_rsa_private_key_t *) &G_gpg_vstate.work.rsa.private;
     switch (ksz) {
-        case 1024 / 8:
-            pkey_size = sizeof(cx_rsa_1024_private_key_t);
-            break;
         case 2048 / 8:
             pkey_size = sizeof(cx_rsa_2048_private_key_t);
             break;
@@ -155,12 +152,6 @@ static int gpg_read_rsa_kyey(gpg_key_t *keygpg) {
     ksz = U2BE(keygpg->attributes.value, 1) >> 3;
     gpg_io_mark();
     switch (ksz) {
-        case 1024 / 8:
-            if (keygpg->priv_key.rsa1024.size == 0) {
-                return SW_REFERENCED_DATA_NOT_FOUND;
-            }
-            gpg_io_insert_tlv(0x81, ksz, (unsigned char *) &keygpg->priv_key.rsa1024.n);
-            break;
         case 2048 / 8:
             if (keygpg->priv_key.rsa2048.size == 0) {
                 return SW_REFERENCED_DATA_NOT_FOUND;
diff --git a/src/gpg_pso.c b/src/gpg_pso.c
index e01968b..7d92b8f 100644
--- a/src/gpg_pso.c
+++ b/src/gpg_pso.c
@@ -72,9 +72,6 @@ static int gpg_sign(gpg_key_t *sigkey) {
         unsigned int ksz, l;
         ksz = U2BE(sigkey->attributes.value, 1) >> 3;
         switch (ksz) {
-            case 1024 / 8:
-                key = (cx_rsa_private_key_t *) &sigkey->priv_key.rsa1024;
-                break;
             case 2048 / 8:
                 key = (cx_rsa_private_key_t *) &sigkey->priv_key.rsa2048;
                 break;
@@ -262,9 +259,6 @@ int gpg_apdu_pso() {
                     ksz = U2BE(G_gpg_vstate.mse_dec->attributes.value, 1) >> 3;
                     key = NULL;
                     switch (ksz) {
-                        case 1024 / 8:
-                            key = (cx_rsa_private_key_t *) &G_gpg_vstate.mse_dec->priv_key.rsa1024;
-                            break;
                         case 2048 / 8:
                             key = (cx_rsa_private_key_t *) &G_gpg_vstate.mse_dec->priv_key.rsa2048;
                             break;
diff --git a/src/gpg_types.h b/src/gpg_types.h
index d0f9239..bfb166c 100644
--- a/src/gpg_types.h
+++ b/src/gpg_types.h
@@ -75,12 +75,8 @@ typedef struct gpg_key_s {
     /*  C1 C2 C3 */
     LV(attributes, GPG_KEY_ATTRIBUTES_LENGTH);
     /*  key value */
-    /* WARN: changing the cx_<key>_t structures breaks backup/restore. Adapt backup/restore code
-     * to ensure backward compatibility.
-     */
     union {
         cx_rsa_private_key_t rsa;
-        cx_rsa_1024_private_key_t rsa1024;
         cx_rsa_2048_private_key_t rsa2048;
         cx_rsa_3072_private_key_t rsa3072;
         cx_rsa_4096_private_key_t rsa4096;
@@ -212,14 +208,12 @@ struct gpg_v_state_s {
         struct {
             union {
                 cx_rsa_public_key_t public;
-                cx_rsa_1024_public_key_t public1024;
                 cx_rsa_2048_public_key_t public2048;
                 cx_rsa_3072_public_key_t public3072;
                 cx_rsa_4096_public_key_t public4096;
             };
             union {
                 cx_rsa_private_key_t private;
-                cx_rsa_1024_private_key_t private1024;
                 cx_rsa_2048_private_key_t private2048;
                 cx_rsa_3072_private_key_t private3072;
                 cx_rsa_4096_private_key_t private4096;