diff --git a/roles/matrix_ma1sd/tasks/user.yml b/roles/matrix_ma1sd/tasks/user.yml
index ce58c53..cec8090 100644
--- a/roles/matrix_ma1sd/tasks/user.yml
+++ b/roles/matrix_ma1sd/tasks/user.yml
@@ -1,5 +1,5 @@
 ---
 
 - name: Create ma1sd user account
-  user: name={{ ma1sd_user }} home={{ ma1sd_root_dir }} shell=/bin/bash state=present
+  user: name={{ ma1sd_user }} home={{ ma1sd_root_dir }} shell=/sbin/nologin state=present
   tags: matrix
diff --git a/roles/matrix_synapse/tasks/user.yml b/roles/matrix_synapse/tasks/user.yml
index c124fd6..21bdb69 100644
--- a/roles/matrix_synapse/tasks/user.yml
+++ b/roles/matrix_synapse/tasks/user.yml
@@ -1,6 +1,6 @@
 ---
 
 - name: Create synapse user account
-  user: name={{ synapse_user }} home={{ synapse_root_dir }} shell=/bin/bash state=present
+  user: name={{ synapse_user }} home={{ synapse_root_dir }} shell=/sbin/nologin state=present
   tags: matrix