diff --git a/tools/signtos/Android.bp b/tools/signtos/Android.bp
index b26631f..688e7b8 100644
--- a/tools/signtos/Android.bp
+++ b/tools/signtos/Android.bp
@@ -21,7 +21,7 @@
     srcs: ["SignTos.java"],
     manifest: "SignTos.mf",
     static_libs: [
-        "bouncycastle",
-        "bouncycastle-bcpkix",
+        "bouncycastle-unbundled",
+        "bouncycastle-bcpkix-unbundled",
     ],
 }