diff --git a/postgres-postgis/Dockerfile b/postgres-postgis/Dockerfile
index a25ea780..90f26114 100644
--- a/postgres-postgis/Dockerfile
+++ b/postgres-postgis/Dockerfile
@@ -1,5 +1,5 @@
-ARG POSTGRES_VERSION=latest
-FROM postgis/postgis:${POSTGRES_VERSION}
+ARG POSTGIS_VERSION=latest
+FROM postgis/postgis:${POSTGIS_VERSION}
 
 LABEL maintainer="Mahmoud Zalt <mahmoud@zalt.me>"