diff --git a/deploy.sh b/deploy.sh
index 273666d..eeccf8e 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -505,7 +505,7 @@ disks_generation() {
 
     # Subtract 2GB for safety (headers, rounding)
     local PART_SIZE_GIB=$(( (MIN_SIZE - 2147483648) / 1024 / 1024 / 1024 ))
-    export PARTITION_SIZE="${PART_SIZE_GIB}GiB"
+    export PARTITION_SIZE="${PART_SIZE_GIB}G"
 
     (envsubst < "templates/nix-config/disks/mirror.nix") >> final-nix-config/etc/nixos/disks/disko.nix