diff --git a/base/reflection.jl b/base/reflection.jl
index 706570303262c..332c3f28225ed 100644
--- a/base/reflection.jl
+++ b/base/reflection.jl
@@ -1084,7 +1084,8 @@ function may_invoke_generator(method::Method, @nospecialize(atypes), sparams::Si
             end
         end
     end
-    non_va_args = method.isva ? method.nargs - 1 : method.nargs
+    nargs = Int(method.nargs)
+    non_va_args = method.isva ? nargs - 1 : nargs
     for i = 1:non_va_args
         if !isdispatchelem(at.parameters[i])
             if (ast_slotflag(code, 1 + i + nsparams) & SLOT_USED) != 0
@@ -1095,7 +1096,7 @@ function may_invoke_generator(method::Method, @nospecialize(atypes), sparams::Si
     if method.isva
         # If the va argument is used, we need to ensure that all arguments that
         # contribute to the va tuple are dispatchelemes
-        if (ast_slotflag(code, 1 + method.nargs + nsparams) & SLOT_USED) != 0
+        if (ast_slotflag(code, 1 + nargs + nsparams) & SLOT_USED) != 0
             for i = (non_va_args+1):length(at.parameters)
                 if !isdispatchelem(at.parameters[i])
                     return false
diff --git a/test/staged.jl b/test/staged.jl
index 4a953ffae33b8..f4349a0a8eaf5 100644
--- a/test/staged.jl
+++ b/test/staged.jl
@@ -312,10 +312,10 @@ end
 end
 g_vararg_generated() = f_vararg_generated((;), (;), Base.inferencebarrier((;)))
 let tup = g_vararg_generated()
-    @test !any(==(Any), tup)
+    @test all(==(typeof((;))), tup)
     # This is just to make sure that the test is actually testing what we want -
     # the test only works if there's an unused that matches the position of the
     # inferencebarrier argument above (N.B. the generator function itself
     # shifts everything over by 1)
-    @test code_lowered(first(methods(f_vararg_generated)).generator.gen)[1].slotflags[5] == UInt8(0x00)
+    @test only(code_lowered(only(methods(f_vararg_generated)).generator.gen)).slotflags[5] == UInt8(0x00)
 end