diff --git a/dropshell-build/build.sh b/dropshell-build/build.sh
index 273e189..28fdcb0 100755
--- a/dropshell-build/build.sh
+++ b/dropshell-build/build.sh
@@ -2,5 +2,5 @@
 
 set -euo pipefail
 
-docker build -t gitea.jde.nz/public/dropshell-build:latest .
+docker build -t gitea.jde.nz/public/dropshell-build:latest -f Dockerfile .