diff --git a/exosphere/src/masterkey.c b/exosphere/src/masterkey.c
index e24b33b42..6116b7cc2 100644
--- a/exosphere/src/masterkey.c
+++ b/exosphere/src/masterkey.c
@@ -76,7 +76,7 @@ bool check_mkey_revision(unsigned int revision, bool is_retail) {
         }
     }
 
-    se_aes_ecb_decrypt_block(check_keyslot, final_vector, 0x10, mkey_vectors[0], 0x10);
+    se_aes_ecb_decrypt_block(check_keyslot, final_vector, 0x10, is_retail ? mkey_vectors[0] : mkey_vectors_dev[0], 0x10);
     for (unsigned int i = 0; i < 0x10; i++) {
         if (final_vector[i] != 0) {
             return false;
diff --git a/fusee/fusee-secondary/src/masterkey.c b/fusee/fusee-secondary/src/masterkey.c
index 5cc466763..ca3bd200f 100644
--- a/fusee/fusee-secondary/src/masterkey.c
+++ b/fusee/fusee-secondary/src/masterkey.c
@@ -73,7 +73,7 @@ static bool check_mkey_revision(unsigned int revision, bool is_retail) {
         }
     }
 
-    se_aes_ecb_decrypt_block(check_keyslot, final_vector, 0x10, mkey_vectors[0], 0x10);
+    se_aes_ecb_decrypt_block(check_keyslot, final_vector, 0x10, is_retail ? mkey_vectors[0] : mkey_vectors_dev[0], 0x10);
     for (unsigned int i = 0; i < 0x10; i++) {
         if (final_vector[i] != 0) {
             return false;