diff --git a/meson.build b/meson.build
index 7959b538..109923ac 100644
--- a/meson.build
+++ b/meson.build
@@ -101,7 +101,8 @@ if cc.get_id() == 'clang'
 
     # Turn _FORTIFY_SOURCE by default on optimised builds (as it requires -O1
     # or higher). This is needed on clang only as gcc enables it by default.
-    if get_option('optimization') != '0'
+    # CrOS sets their preferred FORTIFY level in platform-level CFLAGS.
+    if get_option('optimization') != '0' and get_option('android_platform') != 'cros'
         common_arguments += [
             '-D_FORTIFY_SOURCE=2',
         ]