diff --git a/apps/OpenSign/Dockerhubfile b/apps/OpenSign/Dockerhubfile
index ed756309b..98c41aef3 100644
--- a/apps/OpenSign/Dockerhubfile
+++ b/apps/OpenSign/Dockerhubfile
@@ -14,6 +14,9 @@ RUN npm install
 COPY apps/OpenSign/ .
 COPY apps/OpenSign/.husky .
 
+# build
+RUN npm run build
+
 # Make port 3000 available to the world outside this container
 EXPOSE 3000