diff --git a/roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2 b/roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2
index 81d99fe79..d62a689a9 100644
--- a/roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2
+++ b/roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2
@@ -22,7 +22,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-postgres \
 			--read-only \
 			--tmpfs=/tmp:rw,noexec,nosuid,size=100m \
 			--tmpfs=/run/postgresql:rw,noexec,nosuid,size=100m \
-			--shm-size="256m" \
+			--shm-size=256m \
 			--network={{ matrix_docker_network }} \
 			{% if matrix_postgres_container_postgres_bind_port %}
 			-p {{ matrix_postgres_container_postgres_bind_port }}:5432 \