diff --git a/tools/widl/parser.y b/tools/widl/parser.y
index c1049178cd6..8217e2e7d3d 100644
--- a/tools/widl/parser.y
+++ b/tools/widl/parser.y
@@ -2055,7 +2055,7 @@ struct allowed_attr allowed_attr[] =
     /* ATTR_HELPSTRING */          { 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, "helpstring" },
     /* ATTR_HELPSTRINGCONTEXT */   { 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, "helpstringcontext" },
     /* ATTR_HELPSTRINGDLL */       { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, "helpstringdll" },
-    /* ATTR_HIDDEN */              { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, "hidden" },
+    /* ATTR_HIDDEN */              { 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, "hidden" },
     /* ATTR_ID */                  { 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, "id" },
     /* ATTR_IDEMPOTENT */          { 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "idempotent" },
     /* ATTR_IGNORE */              { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, "ignore" },