diff --git a/Meta/run.sh b/Meta/run.sh
index e9615265e4..83d196235e 100755
--- a/Meta/run.sh
+++ b/Meta/run.sh
@@ -254,7 +254,7 @@ else
     fi
 fi
 
-if [ "$SERENITY_USE_SDCARD" -eq 1 ]; then
+if [ -n "${SERENITY_USE_SDCARD}" ] && [ "${SERENITY_USE_SDCARD}" -eq 1 ]; then
     SERENITY_BOOT_DRIVE="-device sdhci-pci -device sd-card,drive=sd-boot-drive -drive id=sd-boot-drive,if=none,format=raw,file=${SERENITY_DISK_IMAGE}"
     SERENITY_KERNEL_CMDLINE="$SERENITY_KERNEL_CMDLINE root=sd2:0:0"
 fi