diff --git a/.beagle/dockerfile b/.beagle/dockerfile
index b35f59421b3252c94a918770dc9592afd2e8a55a..fa50a0985b2f7603d73557584d679e4a97a7dad7 100644
--- a/.beagle/dockerfile
+++ b/.beagle/dockerfile
@@ -1,4 +1,6 @@
-FROM $BASE
+ARG BASE
+
+FROM ${BASE}
 
 ENV CATALINA_HOME=/home/server/tomcat/