diff --git a/.test/run.sh b/.test/run.sh
index bb3e7d9..7ac3d7b 100755
--- a/.test/run.sh
+++ b/.test/run.sh
@@ -625,7 +625,7 @@ if [ -n "$debarch" ]
 then
 	echo -e "Test: jemalloc preload\n"
 	runandwait -e LD_PRELOAD="/usr/lib/$debarch-linux-gnu/libjemalloc.so.1 /usr/lib/$debarch-linux-gnu/libjemalloc.so.2 /usr/lib64/libjemalloc.so.2" -e MARIADB_ALLOW_EMPTY_ROOT_PASSWORD=1 "${image}"
-	docker exec -i "$cid" gosu mysql /bin/grep 'jemalloc' /proc/1/maps || die "expected to preload jemalloc"
+	docker exec -i --user mysql "$cid" /bin/grep 'jemalloc' /proc/1/maps || die "expected to preload jemalloc"
 
 
 	killoff