diff --git a/fireflyiii/Dockerfile b/fireflyiii/Dockerfile
index 6633938d3..631f109e3 100644
--- a/fireflyiii/Dockerfile
+++ b/fireflyiii/Dockerfile
@@ -33,7 +33,7 @@ RUN \
     #################
     # Fix for 5.7.5 #
     #################
-    if [[ "$BUILD_UPSTREAM" == "5.7.5" ]] ; then \
+    if [ "$BUILD_UPSTREAM" = "5.7.5" ] ; then \
     sed -i "s#'amount'], \$transaction #'amount'], (string)(\$transaction#g" /var/www/html/app/Helpers/Collector/GroupCollector.php \
     && sed -i "s#'0');#'0'));#g" /var/www/html/app/Helpers/Collector/GroupCollector.php; fi