diff --git a/Android.bp b/Android.bp
index 7dfc051..f67ea23 100644
--- a/Android.bp
+++ b/Android.bp
@@ -23,6 +23,10 @@
     static_libs: [
       "dokka-tools-common-m2-deps",
     ],
+    // Pin to Java 8 since dokka doesn't compile with the Java 9 module system
+    // (it references packages under com.sun.tools.doclets which are not
+    // exported from the jdk.javadoc module) (see b/140097603):
+    java_version: "1.8",
     kotlincflags: ["-language-version 1.2 -api-version 1.2 -jvm-target 1.8"],
     use_tools_jar: true,
     java_resource_dirs: ["core/src/main/resources"],