diff --git a/README.md b/README.md
index 2038c78..47689d6 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ FROM php:7.2-cli
 
 ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
 
-RUN chmod +x /usr/local/bin/install-php-extensions && sync && \
+RUN chmod +x /usr/local/bin/install-php-extensions && \
     install-php-extensions gd xdebug
 ```