diff --git a/misc/build.func b/misc/build.func
index dea9e32..aa42ddd 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -12,6 +12,7 @@ variables() {
   DIAGNOSTICS="yes"                                 # sets the DIAGNOSTICS variable to "yes", used for the API call.
   METHOD="default"                                  # sets the METHOD variable to "default", used for the API call.
   RANDOM_UUID="$(cat /proc/sys/kernel/random/uuid)" # generates a random UUID and sets it to the RANDOM_UUID variable.
+  CT_TYPE="${CT_TYPE:-$var_unprivileged}"           # Set an environment variable for the container type.
 }
 
 source <(curl -s https://raw.githubusercontent.com/community-scripts/ProxmoxVED/main/misc/api.func)