--- a/js/src/shell/jsoptparse.cpp	2017-09-25 23:41:50.710311214 +0200
+++ b/js/src/shell/jsoptparse.cpp	2017-09-25 23:42:20.166309990 +0200
@@ -253,7 +253,7 @@
     char *eq = strchr(argv[*i], '=');
     if (eq) {
         *value = eq + 1;
-        if (value[0] == '\0')
+        if (*value[0] == '\0')
             return error("A value is required for option %.*s", eq - argv[*i], argv[*i]);
         return Okay;
     }