diff --git a/Dockerfile.cloudron b/Dockerfile.cloudron
index e32bc67..b25c24e 100644
--- a/Dockerfile.cloudron
+++ b/Dockerfile.cloudron
@@ -25,8 +25,9 @@ RUN curl -L "https://mau.dev/mautrix/signal/-/jobs/artifacts/main/download?job=b
     && chmod +x /app/pkg/mautrix-signal \
     && rm /tmp/mautrix-signal.zip
 
-# Copy startup script
+# Copy startup script and make executable
 COPY start.sh /app/pkg/
+RUN chmod +x /app/pkg/start.sh
 
 # Set volumes and environment
 VOLUME /app/data