diff --git a/data/org.freedesktop.ModemManager1.conf.polkit b/data/org.freedesktop.ModemManager1.conf.polkit
index eaacdcc5..b27b0d53 100644
--- a/data/org.freedesktop.ModemManager1.conf.polkit
+++ b/data/org.freedesktop.ModemManager1.conf.polkit
@@ -71,6 +71,10 @@
            send_interface="org.freedesktop.ModemManager1.Modem"
            send_member="SetCurrentModes"/>
 
+    <allow send_destination="org.freedesktop.ModemManager1"
+           send_interface="org.freedesktop.ModemManager1.Modem"
+           send_member="SetPrimarySimSlot"/>
+
     <allow send_destination="org.freedesktop.ModemManager1"
            send_interface="org.freedesktop.ModemManager1.Modem"
            send_member="SetCurrentBands"/>
diff --git a/data/org.freedesktop.ModemManager1.policy.in.in b/data/org.freedesktop.ModemManager1.policy.in.in
index e9a7324c..59760361 100644
--- a/data/org.freedesktop.ModemManager1.policy.in.in
+++ b/data/org.freedesktop.ModemManager1.policy.in.in
@@ -27,6 +27,15 @@
     </defaults>
   </action>
 
+  <action id="org.freedesktop.ModemManager1.Modem.SetPrimarySimSlot">
+    <description>Set the primary sim slot of a modem</description>
+    <message>System policy prevents configuring modem properties.</message>
+    <defaults>
+      <allow_inactive>no</allow_inactive>
+      <allow_active>@MM_DEFAULT_USER_POLICY@</allow_active>
+    </defaults>
+  </action>
+
   <action id="org.freedesktop.ModemManager1.Device.Control">
     <description>Unlock and control a mobile broadband device</description>
     <message>System policy prevents unlocking or controlling the mobile broadband device.</message>