diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 4bb8844..f038c24 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -772,7 +772,9 @@
 
         // Ignore NOT_METERED being added or removed as it is effectively dynamic. http://b/63326103
         // TODO: properly support NOT_METERED as a mutable and requestable capability.
-        final long mask = ~MUTABLE_CAPABILITIES & ~(1 << NET_CAPABILITY_NOT_METERED);
+        // Ignore DUN being added or removed. http://b/65257223.
+        final long mask = ~MUTABLE_CAPABILITIES
+                & ~(1 << NET_CAPABILITY_NOT_METERED) & ~(1 << NET_CAPABILITY_DUN);
         long oldImmutableCapabilities = this.mNetworkCapabilities & mask;
         long newImmutableCapabilities = that.mNetworkCapabilities & mask;
         if (oldImmutableCapabilities != newImmutableCapabilities) {
diff --git a/tests/net/java/android/net/NetworkCapabilitiesTest.java b/tests/net/java/android/net/NetworkCapabilitiesTest.java
index 7346f9f..743344f 100644
--- a/tests/net/java/android/net/NetworkCapabilitiesTest.java
+++ b/tests/net/java/android/net/NetworkCapabilitiesTest.java
@@ -17,6 +17,7 @@
 package android.net;
 
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CBS;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_DUN;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_EIMS;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED;
@@ -143,6 +144,14 @@
         assertEquals("", nc1.describeImmutableDifferences(nc2));
         assertEquals("", nc1.describeImmutableDifferences(nc1));
 
+        // DUN changing (http://b/65257223)
+        nc1 = new NetworkCapabilities()
+                .addCapability(NET_CAPABILITY_DUN)
+                .addCapability(NET_CAPABILITY_INTERNET);
+        nc2 = new NetworkCapabilities().addCapability(NET_CAPABILITY_INTERNET);
+        assertEquals("", nc1.describeImmutableDifferences(nc2));
+        assertEquals("", nc1.describeImmutableDifferences(nc1));
+
         // Immutable capability changing
         nc1 = new NetworkCapabilities()
                 .addCapability(NET_CAPABILITY_INTERNET)