diff --git a/build/win32/mozconfig.vs-latest b/build/win32/mozconfig.vs-latest
index eef931ed86a2..defca326f5de 100644
--- a/build/win32/mozconfig.vs-latest
+++ b/build/win32/mozconfig.vs-latest
@@ -1 +1,2 @@
 . $topsrcdir/build/win32/mozconfig.vs2017
+. "$topsrcdir/build/mozconfig.clang-cl"
diff --git a/build/win64/mozconfig.vs-latest b/build/win64/mozconfig.vs-latest
index 7cfa5d1ef951..6db26fc6d876 100644
--- a/build/win64/mozconfig.vs-latest
+++ b/build/win64/mozconfig.vs-latest
@@ -1 +1,2 @@
 . $topsrcdir/build/win64/mozconfig.vs2017
+. "$topsrcdir/build/mozconfig.clang-cl"