diff --git a/lld/test/CMakeLists.txt b/lld/test/CMakeLists.txt
--- a/lld/test/CMakeLists.txt
+++ b/lld/test/CMakeLists.txt
@@ -7,6 +7,7 @@
 llvm_canonicalize_cmake_booleans(
   LLVM_ENABLE_ZLIB
   LLVM_ENABLE_LIBXML2
+  LLD_DEFAULT_LD_LLD_IS_MINGW
   )
 
 configure_lit_site_cfg(
diff --git a/lld/test/lit.cfg.py b/lld/test/lit.cfg.py
--- a/lld/test/lit.cfg.py
+++ b/lld/test/lit.cfg.py
@@ -110,3 +110,7 @@
     sout, _ = tar_version.communicate()
     if 'GNU tar' in sout.decode():
         config.available_features.add('gnutar')
+
+# ELF tests expect the default target for ld.lld to be ELF.
+if config.ld_lld_default_mingw:
+    config.excludes.append('ELF')
diff --git a/lld/test/lit.site.cfg.py.in b/lld/test/lit.site.cfg.py.in
--- a/lld/test/lit.site.cfg.py.in
+++ b/lld/test/lit.site.cfg.py.in
@@ -16,6 +16,7 @@
 config.have_zlib = @LLVM_ENABLE_ZLIB@
 config.have_libxml2 = @LLVM_ENABLE_LIBXML2@
 config.sizeof_void_p = @CMAKE_SIZEOF_VOID_P@
+config.ld_lld_default_mingw = @LLD_DEFAULT_LD_LLD_IS_MINGW@
 
 # Support substitution of the tools and libs dirs with user parameters. This is
 # used when we can't determine the tool dir at configuration time.