1 files changed, 1 insertions, 1 deletions
diff --git a/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java b/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
index 2a9f9be..155e323 100644
--- a/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
+++ b/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
@@ -57,7 +57,7 @@ class LambdaClassMaker {
    * Returns absolute paths to .class files generated since the last call to this method together
    * with a string descriptor of the factory method.
    */
-  public Map<Path, LambdaInfo> drain() {
+  public ImmutableMap<Path, LambdaInfo> drain() {
     ImmutableMap<Path, LambdaInfo> result = ImmutableMap.copyOf(generatedClasses);
     generatedClasses.clear();
     return result;