diff --git a/lld/MachO/Writer.cpp b/lld/MachO/Writer.cpp
--- a/lld/MachO/Writer.cpp
+++ b/lld/MachO/Writer.cpp
@@ -351,10 +351,13 @@
     }
   }
 
-  // TODO: dyld requires libSystem to be loaded. libSystem is a universal
-  // binary and we don't have support for that yet, so mock it out here.
-  headerSection->addLoadCommand(
-      make<LCLoadDylib>("/usr/lib/libSystem.B.dylib"));
+  if (dylibOrdinal == 1 && config->outputType == MH_EXECUTE) {
+    // Used in tests, as we also run those tests on non-OSX systems.
+    if (StringRef(getenv("LLD_FORCE_LOAD_LIBSYSTEM")) == "1") {
+      headerSection->addLoadCommand(
+          make<LCLoadDylib>("/usr/lib/libSystem.B.dylib"));
+    }
+  }
 }
 
 void Writer::createHiddenSections() {
diff --git a/lld/test/MachO/lit.local.cfg b/lld/test/MachO/lit.local.cfg
--- a/lld/test/MachO/lit.local.cfg
+++ b/lld/test/MachO/lit.local.cfg
@@ -1,3 +1,4 @@
+config.environment['LLD_FORCE_LOAD_LIBSYSTEM'] = '1'
 config.substitutions += [
     ('%lld', 'lld -flavor darwinnew'),
 ]