diff --git a/libcxx/utils/libcxx/test/dsl.py b/libcxx/utils/libcxx/test/dsl.py
--- a/libcxx/utils/libcxx/test/dsl.py
+++ b/libcxx/utils/libcxx/test/dsl.py
@@ -245,9 +245,14 @@
   %{exec} -- this means that the command may be executed on a remote host
   depending on the %{exec} substitution.
   """
+  # Bionic's locale support is simplistic: it only recognizes two locales, "C"
+  # (aka "POSIX") and "C.UTF-8" (aka "en_US.UTF-8"). The locale mode determines
+  # the MB_CUR_MAX, but there is no true locale stuff (e.g. number formatting).
+  # Treat Bionic as if it lacks locales.
   program = """
     #include <stddef.h>
-    #if defined(_LIBCPP_HAS_NO_LOCALIZATION)
+    #include <stdlib.h>
+    #if defined(_LIBCPP_HAS_NO_LOCALIZATION) || defined(__BIONIC__)
       int main(int, char**) { return 1; }
     #else
       #include <locale.h>