diff --git a/R/build-site.R b/R/build-site.R
index b203db9..c6b818e 100644
--- a/R/build-site.R
+++ b/R/build-site.R
@@ -72,11 +72,6 @@ build_ropensci_docs <- function(path = ".", destination = NULL, install = FALSE,
     override$navbar <- modifyList(override$navbar, navbar_config)
   }
 
-  math_config <- get_math_rendering(path)
-  if (!is.null(math_config)) {
-    override$template$`math-rendering` <- math_config
-  }
-
   find_and_fix_readme(path, pkgname)
 
   # Prevent favicon building
@@ -147,35 +142,6 @@ fixup_navbar_config <- function(path) {
 
 }
 
-# we need this to keep supporting the old syntax we had set up
-# TODO: PR to packages using it so we can remove those lines!
-get_math_rendering <- function(path){
-
-  pkgdown_yml <- pkgdown_config_path(path = path)
-
-  if (is.null(pkgdown_yml)) {
-    return(NULL)
-  }
-
-  pkgdown_config <- yaml::read_yaml(pkgdown_yml)
-
-  if (is.null(pkgdown_config)) {
-    return(NULL)
-  }
-
-  math_rendering <- pkgdown_config$template$`math-rendering`
-  if (!is.null(math_rendering)) {
-    return(math_rendering)
-  }
-
-  if(isTRUE(pkgdown_config$mathjax) || isTRUE(pkgdown_config$template$params$mathjax)){
-    return("mathjax")
-  }
-
-  return(NULL)
-
-}
-
 find_and_fix_readme <- function(path, pkg){
   # From pkgdown build_home_index()
   home_files <- file.path(path, c("index.Rmd", "README.Rmd", "index.md", "README.md"))
diff --git a/tests/testthat/test-mathjax.R b/tests/testthat/test-mathjax.R
deleted file mode 100644
index ed08dd6..0000000
--- a/tests/testthat/test-mathjax.R
+++ /dev/null
@@ -1,51 +0,0 @@
-test_that("adding mathjax works", {
-  withr::local_options(usethis.quiet = TRUE)
-  temp_dir <- withr::local_tempdir()
-  proj <- usethis::create_package(
-    file.path(temp_dir, "testPackage"),
-    rstudio = FALSE,
-    open = FALSE
-  )
-  usethis::local_project(proj)
-  usethis::use_readme_md()
-  usethis::use_pkgdown()
-  yaml <- yaml::read_yaml("_pkgdown.yml")
-  yaml$mathjax <- TRUE
-  yaml::write_yaml(yaml, "_pkgdown.yml")
-  expect_output({
-    suppressMessages(
-      docs <- build_ropensci_docs(
-        destination = "docs",
-        install = FALSE,
-        examples = FALSE)
-    )
-  })
-  homepage <- xml2::read_html(file.path(docs, "index.html"), encoding = "UTF-8")
-  script <- xml2::xml_find_first(homepage, ".//script[contains(@src,'MathJax')]")
-  # If not present the class is xml_missing
-  testthat::expect_s3_class(script, "xml_node")
-})
-
-test_that("NOT adding mathjax works", {
-  withr::local_options(usethis.quiet = TRUE)
-  temp_dir <- withr::local_tempdir()
-  proj <- usethis::create_package(
-    file.path(temp_dir, "testPackage"),
-    rstudio = FALSE,
-    open = FALSE
-  )
-  usethis::local_project(proj)
-  usethis::use_readme_md()
-  usethis::use_pkgdown()
-  expect_output({
-    suppressMessages(
-      docs <- build_ropensci_docs(
-        destination = "docs",
-        install = FALSE,
-        examples = FALSE)
-    )
-  })
-  homepage <- xml2::read_html(file.path(docs, "index.html"), encoding = "UTF-8")
-  script <- xml2::xml_find_first(homepage, ".//script[contains(@src,'MathJax')]")
-  testthat::expect_s3_class(script, "xml_missing")
-})