diff --git a/Dockerfile.proto b/Dockerfile.proto
index 7aa12fa..1eef998 100644
--- a/Dockerfile.proto
+++ b/Dockerfile.proto
@@ -6,7 +6,7 @@ RUN useradd -m app
 
 RUN git clone https://72d861f982d2a76275d5b8178fe0633b19c43d33@dev.ilab.cl/TDTP/proto_backend /srv
 
-EXEC echo apscheduler >> /srv/requirements.txt
+RUN echo apscheduler >> /srv/requirements.txt
 
 COPY fetch.backend_proto.py /srv/fetch.py