diff --git a/bin/convertmmrimport b/bin/convertmmrimport
index 6dbcad2..fecae07 100755
--- a/bin/convertmmrimport
+++ b/bin/convertmmrimport
@@ -59,7 +59,7 @@ chmod 644 /federated/apps/matrix/data/matrix/$DOMAIN.crt /federated/apps/matrix/
 chown -R 991:991 /federated/apps/matrix/data/matrix
 
 # Generate the matrix homeserver.yaml file
-docker run --rm -v "/federated/apps/matrix/data/matrix:/data" -e SYNAPSE_SERVER_NAME=$HOSTNAME -e SYNAPSE_REPORT_STATS=yes matrixdotorg/synapse:latest generate &> /dev/null
+docker run --rm -v "/federated/apps/matrix/data/matrix:/data" -e SYNAPSE_SERVER_NAME=matrix.$DOMAIN -e SYNAPSE_REPORT_STATS=yes matrixdotorg/synapse:latest generate &> /dev/null
 [ $? -ne 0 ] && fail "Couldn't run docker matrixdotorg/synapse:latest generate"
 
 # Take out default Sqlite database config