diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 33bfbcd..fdb7324 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -2404,6 +2404,7 @@
 cc_defaults {
     name: "cronet_aml_defaults",
     cflags: [
+        "-DGOOGLE_PROTOBUF_NO_RTTI",
         "-O2",
         "-Wno-deprecated-non-prototype",
         "-Wno-error=return-type",
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 9ce33b8..e7028d1 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -1276,6 +1276,7 @@
   # Default settings used by all modules.
   defaults = Module('cc_defaults', defaults_module, '//gn:default_deps')
   defaults.cflags = [
+      '-DGOOGLE_PROTOBUF_NO_RTTI',
       '-Wno-error=return-type',
       '-Wno-non-virtual-dtor',
       '-Wno-macro-redefined',