diff --git a/Dockerfile b/Dockerfile
index 21653f3..7e2950f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,11 +23,12 @@ RUN \
   apt-get -y install  wget && \
   rm -rf /var/lib/apt/lists/* 
 
-COPY gw-5.02-linux.tar.chksum /tmp
+RUN \
+  echo "75f55ac1d0aca82faee57a617bbced26  gw-5.02-linux.tar" > /tmp/gw-chksum
 
 RUN \
   cd /tmp && wget --no-check-certificate https://github.com/geneweb/geneweb/releases/download/v5.02/gw-5.02-linux.tar && \
-  md5sum --check gw-5.02-linux.tar.chksum && \ 
+  md5sum --check gw-chksum && \ 
   tar -xf gw-5.02-linux.tar && \
   cd /opt && mkdir geneweb && \
   mv /tmp/distribution/* /opt/geneweb && \
diff --git a/gw-5.02-linux.tar.chksum b/gw-5.02-linux.tar.chksum
deleted file mode 100644
index 935d673..0000000
--- a/gw-5.02-linux.tar.chksum
+++ /dev/null
@@ -1 +0,0 @@
-75f55ac1d0aca82faee57a617bbced26  gw-5.02-linux.tar