diff --git a/root/tmp/setup/php-extensions.sh b/root/tmp/setup/php-extensions.sh
index 7a784ce..e888fe0 100755
--- a/root/tmp/setup/php-extensions.sh
+++ b/root/tmp/setup/php-extensions.sh
@@ -16,7 +16,7 @@ PACKAGES_POSTGRES="libpq5"
 PACKAGES_MYMARIA="libmariadbclient18"
 
 # Packages for other Moodle runtime dependenices.
-PACKAGES_RUNTIME="ghostscript libaio1 libcurl3 libgss3 libicu57 libmcrypt-dev libxml2 libxslt1.1 locales sassc unzip unixodbc"
+PACKAGES_RUNTIME="ghostscript libaio1 libcurl3 libgss3 libicu57 libmcrypt-dev libxml2 libxslt1.1 locales sassc unzip unixodbc sassc"
 
 # Packages for Memcached.
 PACKAGES_MEMCACHED="libmemcached11 libmemcachedutil2"