diff --git a/test/lit.cfg b/test/lit.cfg
index 5e7e0e44498..4eaa507ec42 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -46,7 +46,8 @@ if llvm_obj_root is not None:
         config.environment['PATH'] = path
 
 # Propogate 'HOME' through the environment.
-config.environment['HOME'] = os.environ['HOME']
+if 'HOME' in os.environ:
+    config.environment['HOME'] = os.environ['HOME']
 
 # Propogate LLVM_SRC_ROOT into the environment.
 config.environment['LLVM_SRC_ROOT'] = getattr(config, 'llvm_src_root', '')