diff --git a/.local/bin/contain b/.local/bin/contain
index a3dbba6..8b0a4f7 100755
--- a/.local/bin/contain
+++ b/.local/bin/contain
@@ -60,9 +60,9 @@ _canonicalize_file_path() {
     (cd "$dir" 2>/dev/null && printf '%s/%s\n' "$(pwd -P)" "$file")
 }
 
-DEFAULT_IMAGE=ghcr.io/serverwentdown/env
-DEFAULT_TAG=fedora
-CONTAIN_HOME=/home/ambrose
+: ${DEFAULT_IMAGE:=ghcr.io/serverwentdown/env}
+: ${DEFAULT_TAG:=fedora}
+: ${CONTAIN_HOME:=/home/ambrose}
 . ~/.config/contain
 
 if [[ -f "$(which podman 2>/dev/null)" ]]; then