diff --git a/fusee/fusee-secondary/src/key_derivation.c b/fusee/fusee-secondary/src/key_derivation.c
index c085dad..ac8deea 100644
--- a/fusee/fusee-secondary/src/key_derivation.c
+++ b/fusee/fusee-secondary/src/key_derivation.c
@@ -127,6 +127,9 @@
     /* Get needed data. */
     set_aes_keyslot(0xC, g_dec_keyblobs[MASTERKEY_REVISION_500_CURRENT].keys[0], 0x10);
 
+    /* Also set the Package1 key for the revision that is stored on the eMMC boot0 partition. */
+    load_package1_key(available_revision);
+
     /* Derive keys for Exosphere, lock critical keyslots. */
     switch (target_firmware) {
         case EXOSPHERE_TARGET_FIRMWARE_100: