diff --git a/Dockerfile.phptest b/Dockerfile.phptest
index 384fd57..be2fb11 100644
--- a/Dockerfile.phptest
+++ b/Dockerfile.phptest
@@ -3,10 +3,5 @@
 
 FROM registry.leenooks.net/leenooks/php:7.4-fpm-mp
 
-RUN apt-get update && apt-get install -y autoconf \
-	&& pecl install xdebug \
-	&& docker-php-ext-enable xdebug \
-	&& apt-get purge autoonf \
-	&& apt-get -y autoremove \
-	&& apt-get clean \
-	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+RUN apt-get pecl install xdebug \
+	&& docker-php-ext-enable xdebug