diff --git a/xpcom/tests/TestHarness.h b/xpcom/tests/TestHarness.h
index fa80494baca..f9ca4b32c7c 100644
--- a/xpcom/tests/TestHarness.h
+++ b/xpcom/tests/TestHarness.h
@@ -44,6 +44,14 @@
 #ifndef TestHarness_h__
 #define TestHarness_h__
 
+#if defined(_MSC_VER) && defined(MOZ_STATIC_JS)
+/*
+ * Including jsdbgapi.h may cause build break with --disable-shared-js
+ * This is a workaround for bug 673616.
+ */
+#define STATIC_JS_API
+#endif
+
 #include "nsComponentManagerUtils.h"
 #include "nsServiceManagerUtils.h"
 #include "nsCOMPtr.h"