diff --git a/src/rule_definition_tools.jl b/src/rule_definition_tools.jl
index 10ce7beec..0bc8f1e5b 100644
--- a/src/rule_definition_tools.jl
+++ b/src/rule_definition_tools.jl
@@ -409,7 +409,7 @@ function _nondiff_frule_expr(__source__, primal_sig_parts, primal_invoke)
             return ($(esc(_with_kwargs_expr(primal_invoke, kwargs))), NoTangent())
         end
         function ChainRulesCore.frule(
-            @nospecialize(::Tuple), $(map(esc, primal_sig_parts)...)
+            @nospecialize(::Any), $(map(esc, primal_sig_parts)...)
         )
             $(__source__)
             # Julia functions always only have 1 output, so return a single NoTangent()