diff --git a/Dockerfile b/Dockerfile
index a22a736..ae121d1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,6 +33,8 @@ RUN npm run check
 
 # ---------- the site's server build ----------
 FROM deps AS site-build
+# Workspace packages' tsconfigs extend the root one; Vite reads them during the build.
+COPY tsconfig.base.json ./
 COPY packages packages
 COPY services/site services/site
 RUN npm run build -w @gk/site