diff --git a/tools/javadoc/javadoc.bzl b/tools/javadoc/javadoc.bzl
index 1575cb6..41c85cd 100644
--- a/tools/javadoc/javadoc.bzl
+++ b/tools/javadoc/javadoc.bzl
@@ -24,7 +24,13 @@ def _android_jar(android_api_level):
 def _javadoc_library(ctx):
     _check_non_empty(ctx.attr.root_packages, "root_packages")
 
-    transitive_deps = [dep.java.transitive_deps for dep in ctx.attr.deps]
+    transitive_deps = []
+    for dep in ctx.attr.deps:
+        if JavaInfo in dep:
+            transitive_deps.append(dep[JavaInfo].transitive_deps)
+        elif hasattr(dep, "java"):
+            transitive_deps.append(dep.java.transitive_deps)
+
     if ctx.attr._android_jar:
         transitive_deps.append(ctx.attr._android_jar.files)