diff --git a/caddy/Dockerfile b/caddy/Dockerfile
index 3f815e3..1f7797f 100644
--- a/caddy/Dockerfile
+++ b/caddy/Dockerfile
@@ -174,8 +174,8 @@ ENV \
     CORAZA_UPLOAD_FILE_MODE=0600 \
     CORAZA_UPLOAD_KEEP_FILES="Off" \
     PORT=8080 \
-    XDG_CONFIG_HOME="$CADDY_CONFIG_DIR" \
-    XDG_DATA_HOME="$CADDY_DATA_DIR" \
+    XDG_CONFIG_HOME="${CADDY_CONFIG_DIR}" \
+    XDG_DATA_HOME="${CADDY_DATA_DIR}" \
     # CRS specific variables
     PARANOIA=1 \
     ANOMALY_INBOUND=5 \