diff --git a/Makefile b/Makefile
index d61a5df..3f8ee93 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ POSTFIXADMIN_VERSION?=3.3.15 # renovate: datasource=github-tags depName=postfixa
 PODMAN_BIN?=$(shell which podman)
 
 # POSTFIXADMIN_IMAGE
-POSTFIXADMIN_IMAGE_REGISTRY_HOST:=git.cryptic.systems
+POSTFIXADMIN_IMAGE_REGISTRY_HOST?=git.cryptic.systems
 POSTFIXADMIN_IMAGE_REPOSITORY?=volker.raschek/postfixadmin
 POSTFIXADMIN_IMAGE_VERSION?=latest
 POSTFIXADMIN_IMAGE_FULLY_QUALIFIED=${POSTFIXADMIN_IMAGE_REGISTRY_HOST}/${POSTFIXADMIN_IMAGE_REPOSITORY}:${POSTFIXADMIN_IMAGE_VERSION}