diff --git a/test/lit.cfg b/test/lit.cfg
index 88d373171879b..c0356c0d6ed9a 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -1092,13 +1092,15 @@ if run_vendor == 'apple':
     # tests.
     # rdar://70787171
     if "stdlib_lto" in config.available_features:
-        for library in ["swiftCore", "swiftStdlibUnittest",
-                        "swiftStdlibUnicodeUnittest",
-                        "swiftStdlibCollectionUnittest",
-                        "swiftSwiftPrivateLibcExtras", "swiftSwiftPrivate",
-                        "swiftDarwin", "swiftSwiftPrivateThreadExtras",
-                        "swiftSwiftOnoneSupport", "swift_Concurrency",
-                        "swift_Backtracing"]:
+        libraries = ["swiftCore", "swiftStdlibUnittest",
+                     "swiftStdlibUnicodeUnittest",
+                     "swiftStdlibCollectionUnittest",
+                     "swiftSwiftPrivateLibcExtras", "swiftSwiftPrivate",
+                     "swiftDarwin", "swiftSwiftPrivateThreadExtras",
+                     "swiftSwiftOnoneSupport", "swift_Concurrency"]
+        if backtracing is not None:
+            libraries.append('swift_Backtracing')
+        for library in libraries:
             swift_execution_tests_extra_flags += ' -Xlinker -l%s'% library
 
         swift_native_clang_tools_path = lit_config.params.get('swift_native_clang_tools_path', None)
diff --git a/utils/build-presets.ini b/utils/build-presets.ini
index 5112f0d62a325..5b53db6adcbbe 100644
--- a/utils/build-presets.ini
+++ b/utils/build-presets.ini
@@ -2559,6 +2559,7 @@ swift-objc-interop=0
 swift-enable-dispatch=0
 swift-implicit-concurrency-import=0
 swift-stdlib-support-back-deployment=0
+swift-enable-backtracing=0
 swift-enable-reflection=0
 swift-stdlib-reflection-metadata=debugger-only
 swift-stdlib-stable-abi=0