diff --git a/tests/common/java/android/net/IpPrefixTest.java b/tests/common/java/android/net/IpPrefixTest.java
index 50ecb42..f61c8c3 100644
--- a/tests/common/java/android/net/IpPrefixTest.java
+++ b/tests/common/java/android/net/IpPrefixTest.java
@@ -122,6 +122,9 @@
 
         p = new IpPrefix("[2001:db8::123]/64");
         assertEquals("2001:db8::/64", p.toString());
+
+        p = new IpPrefix(InetAddresses.parseNumericAddress("::128"), 64);
+        assertEquals("::/64", p.toString());
     }
 
     @Test