diff --git a/nginx-php/7.1/Dockerfile b/nginx-php/7.1/Dockerfile
index 3f4c5fe..10ff63a 100644
--- a/nginx-php/7.1/Dockerfile
+++ b/nginx-php/7.1/Dockerfile
@@ -177,6 +177,7 @@ RUN NB_CORES=${BUILD_CORES-$(getconf _NPROCESSORS_CONF)} \
  && { find /usr/local/bin /usr/local/sbin -type f -perm +0111 -exec strip --strip-all '{}' + || true; } \
  && make clean \
  && chmod u+x /usr/local/bin/* /etc/s6.d/*/* \
+ && sleep 1 \
  && docker-php-ext-install ${PHP_EXT_LIST} \
  && apk del ${BUILD_DEPS} \
  && rm -rf /tmp/* /var/cache/apk/* /usr/src/* \