diff --git a/tsconfig.json b/tsconfig.json
index d90dfe980b..5fcdffabb4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -24,6 +24,7 @@
     "jslib/node_modules",
     "dist",
     "jslib/dist",
+    "jslib/spec",
     "build",
     "build.safariextension",
     "coverage",