diff --git a/js/public/RootingAPI.h b/js/public/RootingAPI.h
index 62d3f0f1cb68..9b64ff5ded3e 100644
--- a/js/public/RootingAPI.h
+++ b/js/public/RootingAPI.h
@@ -867,6 +867,9 @@ class JS_PUBLIC_API(AutoGCRooter)
     enum {
         VALARRAY =     -2, /* js::AutoValueArray */
         PARSER =       -3, /* js::frontend::Parser */
+#if defined(JS_BUILD_BINAST)
+        BINPARSER =    -4, /* js::frontend::BinSource */
+#endif // defined(JS_BUILD_BINAST)
         VALVECTOR =   -10, /* js::AutoValueVector */
         IDVECTOR =    -11, /* js::AutoIdVector */
         OBJVECTOR =   -14, /* js::AutoObjectVector */
diff --git a/js/src/frontend/BytecodeCompiler.h b/js/src/frontend/BytecodeCompiler.h
index 82ea548279cc..97578ed4f7a7 100644
--- a/js/src/frontend/BytecodeCompiler.h
+++ b/js/src/frontend/BytecodeCompiler.h
@@ -124,6 +124,11 @@ IsKeyword(JSLinearString* str);
 void
 TraceParser(JSTracer* trc, JS::AutoGCRooter* parser);
 
+/* Trace all GC things reachable from binjs parser. Defined in BinSource.cpp. */
+void
+TraceBinParser(JSTracer* trc, JS::AutoGCRooter* parser);
+
+
 class MOZ_STACK_CLASS AutoFrontendTraceLog
 {
 #ifdef JS_TRACE_LOGGING
diff --git a/js/src/gc/RootMarking.cpp b/js/src/gc/RootMarking.cpp
index c0ee94921941..ac9e2a2f0a58 100644
--- a/js/src/gc/RootMarking.cpp
+++ b/js/src/gc/RootMarking.cpp
@@ -153,6 +153,12 @@ AutoGCRooter::trace(JSTracer* trc)
         frontend::TraceParser(trc, this);
         return;
 
+#if defined(JS_BUILD_BINAST)
+      case BINPARSER:
+        frontend::TraceBinParser(trc, this);
+        return;
+#endif // defined(JS_BUILD_BINAST)
+
       case VALARRAY: {
         /*
          * We don't know the template size parameter, but we can safely treat it