Index: lib/sanitizer_common/sanitizer_flags.inc
===================================================================
--- lib/sanitizer_common/sanitizer_flags.inc
+++ lib/sanitizer_common/sanitizer_flags.inc
@@ -62,7 +62,8 @@
 COMMON_FLAG(
     int, verbosity, 0,
     "Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).")
-COMMON_FLAG(bool, detect_leaks, !SANITIZER_MAC, "Enable memory leak detection.")
+COMMON_FLAG(bool, detect_leaks, !(SANITIZER_MAC && (SANITIZER_WORDSIZE != 64)),
+            "Enable memory leak detection.")
 COMMON_FLAG(
     bool, leak_check_at_exit, true,
     "Invoke leak checking in an atexit handler. Has no effect if "
Index: test/asan/lit.cfg
===================================================================
--- test/asan/lit.cfg
+++ test/asan/lit.cfg
@@ -38,11 +38,6 @@
   # Also, make sure we do not overwhelm the syslog while testing.
   default_asan_opts = 'abort_on_error=0'
   default_asan_opts += ':log_to_syslog=0'
-
-  # On Darwin, leak checking is not enabled by default. Enable for x86_64
-  # tests to prevent regressions
-  if config.target_arch == 'x86_64':
-    default_asan_opts += ':detect_leaks=1'
 elif config.android:
   # The same as on Darwin, we default to "abort_on_error=1" which slows down
   # testing. Also, all existing tests are using "not" instead of "not --crash"