diff --git a/src/macroexpand.scm b/src/macroexpand.scm
index a0f05a3af687aa..5e55c7bbb29c16 100644
--- a/src/macroexpand.scm
+++ b/src/macroexpand.scm
@@ -210,7 +210,8 @@
         ((atom? v) '())
         (else
          (case (car v)
-           ((... kw |::| =) (try-arg-name (cadr v)))
+           ((|::|) (if (length= v 2) '() (try-arg-name (cadr v))))
+           ((... kw =) (try-arg-name (cadr v)))
            ((escape) (list v))
            ((hygienic-scope) (try-arg-name (cadr v)))
            ((meta)  ;; allow certain per-argument annotations
diff --git a/test/syntax.jl b/test/syntax.jl
index 1d6193b2f2634a..76e15c78b27506 100644
--- a/test/syntax.jl
+++ b/test/syntax.jl
@@ -2686,3 +2686,9 @@ macro m_begin_hygiene(a)
 end
 
 @test @m_begin_hygiene([1, 2, 3]) == 1
+
+macro m_nospecialize_unnamed_hygiene()
+    return :(f(@nospecialize(::Any)) = Any)
+end
+
+@test @m_nospecialize_unnamed_hygiene()(1) === Any