diff --git a/lib/apps/nixos-install.sh b/lib/apps/nixos-install.sh
index 2d7ee33f..baf39a3a 100644
--- a/lib/apps/nixos-install.sh
+++ b/lib/apps/nixos-install.sh
@@ -32,7 +32,7 @@ echo '4'
 }
 
 echo '5'
-NUM_NVME_DISKS=$(echo "${DISK}" | grep "^/dev/nvme" -c)
+NUM_NVME_DISKS=$(echo "${DISK}" | grep "^/dev/nvme" -c || echo 0)
 readonly NUM_NVME_DISKS
 
 echo '6'