diff --git a/src/main/java/org/asamk/signal/manager/Manager.java b/src/main/java/org/asamk/signal/manager/Manager.java
index 3642d6db..b8a0f57b 100644
--- a/src/main/java/org/asamk/signal/manager/Manager.java
+++ b/src/main/java/org/asamk/signal/manager/Manager.java
@@ -415,6 +415,9 @@ public class Manager implements Closeable {
     }
 
     public void setRegistrationLockPin(Optional<String> pin) throws IOException, UnauthenticatedResponseException {
+        if (!account.isMasterDevice()) {
+            throw new RuntimeException("Only master device can set a PIN");
+        }
         if (pin.isPresent()) {
             final MasterKey masterKey = account.getPinMasterKey() != null
                     ? account.getPinMasterKey()
diff --git a/src/main/java/org/asamk/signal/manager/storage/SignalAccount.java b/src/main/java/org/asamk/signal/manager/storage/SignalAccount.java
index a6e243a8..cb6f7461 100644
--- a/src/main/java/org/asamk/signal/manager/storage/SignalAccount.java
+++ b/src/main/java/org/asamk/signal/manager/storage/SignalAccount.java
@@ -505,6 +505,10 @@ public class SignalAccount implements Closeable {
         this.deviceId = deviceId;
     }
 
+    public boolean isMasterDevice() {
+        return deviceId == SignalServiceAddress.DEFAULT_DEVICE_ID;
+    }
+
     public String getPassword() {
         return password;
     }