diff --git a/src/ecmascript/ecmascript.c b/src/ecmascript/ecmascript.c
index 0ef64f70f..599443c0e 100644
--- a/src/ecmascript/ecmascript.c
+++ b/src/ecmascript/ecmascript.c
@@ -150,6 +150,7 @@ ecmascript_put_interpreter(struct ecmascript_interpreter *interpreter)
 	if (interpreter->vs->doc_view)
 		kill_timer(&interpreter->vs->doc_view->document->timeout);
 	interpreter->vs->ecmascript = NULL;
+	interpreter->vs->ecmascript_fragile = 1;
 	mem_free(interpreter);
 }