diff --git a/postgres/Dockerfile b/postgres/Dockerfile
index 4ca04715d..5881f96c4 100644
--- a/postgres/Dockerfile
+++ b/postgres/Dockerfile
@@ -29,8 +29,8 @@ ENV S6_CMD_WAIT_FOR_SERVICES=1 \
 
 RUN \
     # Correct for access
-    sed "s/.*listen_addresses(.*)/listen_addresses = '*'(1)/g" /usr/local/share/postgresql/postgresql.conf.sample && \
-    sed "s/.*data_directory(.*)/data_directory = '/data'(1)/g" /usr/local/share/postgresql/postgresql.conf.sample
+    sed -i "s/.*listen_addresses(.*)/listen_addresses = '*'(1)/g" /usr/local/share/postgresql/postgresql.conf.sample && \
+    sed -i "s/.*data_directory(.*)/data_directory = '/data'(1)/g" /usr/local/share/postgresql/postgresql.conf.sample || true
 
 ##################
 # 3 Install apps #