diff --git a/docker-compose/cron.dockerfile b/docker-compose/cron.dockerfile
index 633db3d2..bf5d4692 100644
--- a/docker-compose/cron.dockerfile
+++ b/docker-compose/cron.dockerfile
@@ -1,6 +1,9 @@
 FROM php:7.4-fpm-alpine
 
-RUN docker-php-ext-install pdo pdo_mysql
+RUN apk add --no-cache \
+    php7-bcmath
+
+RUN docker-php-ext-install pdo pdo_mysql bcmath
 
 COPY docker-compose/crontab /etc/crontabs/root