diff --git a/stdlib/Markdown/src/render/latex.jl b/stdlib/Markdown/src/render/latex.jl
index 1e885a578d588..8182adba96039 100644
--- a/stdlib/Markdown/src/render/latex.jl
+++ b/stdlib/Markdown/src/render/latex.jl
@@ -100,7 +100,7 @@ function latex(io::IO, md::List)
     end
 end
 
-function show(io::IO, ::MIME"text/latex", md::HorizontalRule)
+function latex(io::IO, md::HorizontalRule)
     println(io, "\\rule{\\textwidth}{1pt}")
 end
 
diff --git a/stdlib/Markdown/test/runtests.jl b/stdlib/Markdown/test/runtests.jl
index e1d03fdffaffd..6c5f82278eddf 100644
--- a/stdlib/Markdown/test/runtests.jl
+++ b/stdlib/Markdown/test/runtests.jl
@@ -1108,3 +1108,9 @@ let
     @test v.content[5].loose
     @test !v.content[7].loose
 end
+
+# issue #29995
+let m = Markdown.parse("---"), io = IOBuffer()
+    show(io, "text/latex", m)
+    @test String(take!(io)) == "\\rule{\\textwidth}{1pt}\n"
+end