diff --git a/rpi-eeprom-update b/rpi-eeprom-update
index 7da022f..298131d 100755
--- a/rpi-eeprom-update
+++ b/rpi-eeprom-update
@@ -469,8 +469,8 @@ write_status_info()
    [ -z "${MACHINE_OUTPUT}" ] && return 0
 
    exit_code="${1:-EXIT_FAILED}"
-   bootloader_cur="${BOOTLOADER_CURRENT_VERSION}"
-   bootloader_new="${BOOTLOADER_UPDATE_VERSION}"
+   bootloader_cur="${BOOTLOADER_CURRENT_VERSION:-0}"
+   bootloader_new="${BOOTLOADER_UPDATE_VERSION:-0}"
    vl805_cur="${VL805_CURRENT_VERSION}"
    vl805_new="${VL805_UPDATE_VERSION}"
 
@@ -486,8 +486,8 @@ EOF
       cat > "${MACHINE_OUTPUT}" <<EOF
 {
   "EXITCODE": "${exit_code}",
-  "BOOTLOADER_CURRENT": ${bootloader_cur:-0},
-  "BOOTLOADER_LATEST": ${bootloader_new:-0},
+  "BOOTLOADER_CURRENT": ${bootloader_cur},
+  "BOOTLOADER_LATEST": ${bootloader_new},
   "VL805_CURRENT": "${vl805_cur}",
   "VL805_LATEST": "${vl805_new}"
 }