diff --git a/libc/Android.bp b/libc/Android.bp
index 204ad19..62ac512 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1567,7 +1567,11 @@
             srcs: ["bionic/mmap.cpp"],
         },
     },
-
+    product_variables: {
+        treble: {
+            cflags: ["-D__ANDROID_TREBLE__"],
+        },
+    },
     cppflags: ["-Wold-style-cast"],
     local_include_dirs: ["stdio"],
     include_dirs: ["bionic/libstdc++/include"],