diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index 81cb0b62f..e0b51710b 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -103,7 +103,8 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_WEB_UI= \
     PUID= \
     PGID= \
-    TRANSMISSION_WEB_HOME=
+    TRANSMISSION_WEB_HOME= \
+    DROP_DEFAULT_ROUTE=
 
 # Expose port and run
 EXPOSE 9091
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index dbe2181fd..f691c672a 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -105,7 +105,8 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_WEB_UI=\
     PUID=\
     PGID=\
-    TRANSMISSION_WEB_HOME=
+    TRANSMISSION_WEB_HOME= \
+    DROP_DEFAULT_ROUTE=
 
 # Expose port and run
 EXPOSE 9091