diff --git a/rialto/Android.bp b/rialto/Android.bp
index 326f6fc..12d6e7b 100644
--- a/rialto/Android.bp
+++ b/rialto/Android.bp
@@ -13,6 +13,7 @@
         "libbssl_ffi_nostd",
         "libciborium_io_nostd",
         "libciborium_nostd",
+        "libcstr",
         "libdiced_open_dice_nostd",
         "libdiced_sample_inputs_nostd",
         "libhyp",