diff --git a/jimfs/src/main/java/com/google/common/jimfs/AttributeService.java b/jimfs/src/main/java/com/google/common/jimfs/AttributeService.java
index 333a49736..2b38ded45 100644
--- a/jimfs/src/main/java/com/google/common/jimfs/AttributeService.java
+++ b/jimfs/src/main/java/com/google/common/jimfs/AttributeService.java
@@ -316,7 +316,7 @@ public ImmutableMap<String, Object> readAttributes(File file, String attributes)
       throw new IllegalArgumentException("invalid attributes: " + attributes);
     }
 
-    Map<String, Object> result = new HashMap<>();
+    ImmutableMap.Builder<String, Object> result = ImmutableMap.builder();
     if (attrs.size() == 1 && attrs.contains(ALL_ATTRIBUTES)) {
       // for 'view:*' format, get all keys for all providers for the view
       AttributeProvider provider = providersByName.get(view);
@@ -333,7 +333,7 @@ public ImmutableMap<String, Object> readAttributes(File file, String attributes)
       }
     }
 
-    return ImmutableMap.copyOf(result);
+    return result.buildKeepingLast();
   }
 
   /**
@@ -351,7 +351,8 @@ public <A extends BasicFileAttributes> A readAttributes(File file, Class<A> type
     throw new UnsupportedOperationException("unsupported attributes type: " + type);
   }
 
-  private static void readAll(File file, AttributeProvider provider, Map<String, Object> map) {
+  private static void readAll(
+      File file, AttributeProvider provider, ImmutableMap.Builder<String, Object> map) {
     for (String attribute : provider.attributes(file)) {
       Object value = provider.get(file, attribute);