diff --git a/build_library/grub_install.sh b/build_library/grub_install.sh
index 5701ee1cc5..4b3aa3b455 100755
--- a/build_library/grub_install.sh
+++ b/build_library/grub_install.sh
@@ -194,23 +194,23 @@ case "${FLAGS_target}" in
         sudo mkdir -p "${ESP_DIR}/EFI/boot"
         # Use the test keys for signing unofficial builds
         if [[ ${COREOS_OFFICIAL:-0} -ne 1 ]]; then
-            sudo sbsign --key /usr/share/sb_keys/shim.rsa \
+            sudo sbsign --key /usr/share/sb_keys/shim.key \
                     --cert /usr/share/sb_keys/shim.pem \
                     "${ESP_DIR}/${GRUB_DIR}/${CORE_NAME}"
             sudo cp "${ESP_DIR}/${GRUB_DIR}/${CORE_NAME}.signed" \
                 "${ESP_DIR}/EFI/boot/grubx64.efi"
-            sudo sbsign --key /usr/share/sb_keys/shim.rsa \
+            sudo sbsign --key /usr/share/sb_keys/shim.key \
                     --cert /usr/share/sb_keys/shim.pem \
                     "/usr/lib/shim/mmx64.efi"
             sudo cp "/usr/lib/shim/mmx64.efi.signed" \
                 "${ESP_DIR}/EFI/boot/mmx64.efi"
-            sudo sbsign --key /usr/share/sb_keys/shim.rsa \
+            sudo sbsign --key /usr/share/sb_keys/shim.key \
                     --cert /usr/share/sb_keys/shim.pem \
                     "/usr/lib/shim/fbx64.efi"
             sudo cp "/usr/lib/shim/fbx64.efi.signed" \
                 "${ESP_DIR}/EFI/boot/fbx64.efi"
             sudo sbsign --key /usr/share/sb_keys/DB.key \
-                 --cert /usr/share/sb_keys/DB.cert \
+                 --cert /usr/share/sb_keys/DB.crt \
                  --output "${ESP_DIR}/EFI/boot/bootx64.efi" \
                  "/usr/lib/shim/shim.efi"
         else