diff --git a/test/lit.cfg b/test/lit.cfg
index 7dbb90dfde51b..2f899e146eef9 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -1338,12 +1338,13 @@ rth_flags = ''
 if swift_execution_tests_extra_flags:
     rth_flags = swift_execution_tests_extra_flags + ' -wmo'
 
+# FIXME: why can we not use %rth and have that be expanded out?
 config.target_resilience_test = (
-     '%s --target-build-swift "%s" --target-run "%s" --t %%t --S %%S --s %%s '
-     '--lib-prefix "%s" --lib-suffix "%s" --target-codesign "%s" '
+     '%r %s --target-build-swift "%s" --target-run "%s" --t %%t --S %%S '
+     '--s %%s --lib-prefix "%s" --lib-suffix "%s" --target-codesign "%s" '
      '--additional-compile-flags "%s" --triple "%s"'
-     % (config.rth, config.target_build_swift, config.target_run,
-        config.target_shared_library_prefix,
+     % (sys.executable, config.rth, config.target_build_swift,
+        config.target_run, config.target_shared_library_prefix,
         config.target_shared_library_suffix, config.target_codesign,
         rth_flags, config.variant_triple))