diff --git a/base/docs/Docs.jl b/base/docs/Docs.jl
index c9de490bcb67f..d409eea9a6ca8 100644
--- a/base/docs/Docs.jl
+++ b/base/docs/Docs.jl
@@ -281,7 +281,7 @@ function astname(x::Expr, ismacro::Bool)
         ismacro ? macroname(x) : x
     # Call overloading, e.g. `(a::A)(b) = b` or `function (a::A)(b) b end` should document `A(b)`
     elseif (isexpr(x, :function) || isexpr(x, :(=))) && isexpr(x.args[1], :call) && isexpr(x.args[1].args[1], :(::))
-        return astname(x.args[1].args[1].args[2], ismacro)
+        return astname(x.args[1].args[1].args[end], ismacro)
     else
         n = isexpr(x, (:module, :struct)) ? 2 : 1
         astname(x.args[n], ismacro)
diff --git a/test/docs.jl b/test/docs.jl
index 3a925d65a4334..c6cbb3847ae28 100644
--- a/test/docs.jl
+++ b/test/docs.jl
@@ -1121,6 +1121,13 @@ struct A_20087 end
 
 @test docstrings_equal(@doc(A_20087()), doc"a")
 
+struct B_20087 end
+
+"""b"""
+(::B_20087)() = a
+
+@test docstrings_equal(@doc(B_20087()), doc"b")
+
 # issue #27832
 
 _last_atdoc = Core.atdoc