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diff --git a/mfbt/JsRust.h b/mfbt/JsRust.h
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Checking for jsrust crate availability for linking.
+ * For testing, define MOZ_PRETEND_NO_JSRUST to pretend
+ * that we don't have jsrust.
+ */
+
+#ifndef mozilla_JsRust_h
+#define mozilla_JsRust_h
+
+#if (defined(MOZ_HAS_MOZGLUE) || defined(MOZILLA_INTERNAL_API)) && \
+ !defined(MOZ_PRETEND_NO_JSRUST)
+# define MOZ_HAS_JSRUST() 1
+#else
+# define MOZ_HAS_JSRUST() 0
+#endif
+
+#endif // mozilla_JsRust_h