diff --git a/tools/java/runfiles/AutoBazelRepositoryProcessor.java b/tools/java/runfiles/AutoBazelRepositoryProcessor.java
index ae356d800f6d03..51d3a77600b794 100644
--- a/tools/java/runfiles/AutoBazelRepositoryProcessor.java
+++ b/tools/java/runfiles/AutoBazelRepositoryProcessor.java
@@ -19,7 +19,9 @@
 
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.ArrayDeque;
 import java.util.Collections;
+import java.util.Deque;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Stream;
@@ -80,18 +82,14 @@ private void emitClass(TypeElement annotatedClass) {
     // AutoBazelRepository_Outer_Middle_Inner.
     // Note: There can be collisions when local classes are involved, but since the definition of a
     // class depends only on the containing Bazel target, this does not result in ambiguity.
-    List<String> nestedClassNames =
-        Stream.iterate(
-                annotatedClass,
-                element -> element instanceof TypeElement,
-                Element::getEnclosingElement)
-            .map(Element::getSimpleName)
-            .map(Name::toString)
-            .collect(toList());
-    Collections.reverse(nestedClassNames);
-    String generatedClassSimpleName =
-        Stream.concat(Stream.of("AutoBazelRepository"), nestedClassNames.stream())
-            .collect(joining("_"));
+    Deque<String> classNameSegments = new ArrayDeque<>();
+    Element element = annotatedClass;
+    while (element instanceof TypeElement) {
+      classNameSegments.addFirst(element.getSimpleName().toString());
+      element = element.getEnclosingElement();
+    }
+    classNameSegments.addFirst("AutoBazelRepository");
+    String generatedClassSimpleName = String.join("_", classNameSegments);
 
     String generatedClassPackage =
         processingEnv.getElementUtils().getPackageOf(annotatedClass).getQualifiedName().toString();