diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index 5f68f779c4eb0..74aa8fe5949b8 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -246,7 +246,6 @@ run-make/rustdoc-scrape-examples-multiple/Makefile
 run-make/rustdoc-scrape-examples-remap/Makefile
 run-make/rustdoc-scrape-examples-test/Makefile
 run-make/rustdoc-scrape-examples-whitespace/Makefile
-run-make/rustdoc-themes/Makefile
 run-make/rustdoc-verify-output-files/Makefile
 run-make/rustdoc-with-out-dir-option/Makefile
 run-make/rustdoc-with-output-option/Makefile
diff --git a/tests/run-make/rustdoc-themes/Makefile b/tests/run-make/rustdoc-themes/Makefile
deleted file mode 100644
index a4980eb0b3e4d..0000000000000
--- a/tests/run-make/rustdoc-themes/Makefile
+++ /dev/null
@@ -1,11 +0,0 @@
-include ../tools.mk
-
-# Test that rustdoc will properly load in a theme file and display it in the theme selector.
-
-OUTPUT_DIR := "$(TMPDIR)/rustdoc-themes"
-
-all:
-	awk '/Begin theme: light/ {in_theme=1;next} /End theme:/ {in_theme=0} { if (in_theme) print }' \
-		< '$(S)/src/librustdoc/html/static/css/noscript.css' > '$(TMPDIR)/test.css'
-	$(RUSTDOC) -o $(OUTPUT_DIR) foo.rs --theme $(TMPDIR)/test.css
-	$(HTMLDOCCK) $(OUTPUT_DIR) foo.rs
diff --git a/tests/run-make/rustdoc-themes/rmake.rs b/tests/run-make/rustdoc-themes/rmake.rs
new file mode 100644
index 0000000000000..1d7dfe6bb2a09
--- /dev/null
+++ b/tests/run-make/rustdoc-themes/rmake.rs
@@ -0,0 +1,31 @@
+// Test that rustdoc will properly load in a theme file and display it in the theme selector.
+
+use run_make_support::{htmldocck, rustdoc, source_path, tmp_dir};
+
+fn main() {
+    let out_dir = tmp_dir().join("rustdoc-themes");
+    let test_css = out_dir.join("test.css");
+
+    let no_script =
+        std::fs::read_to_string(source_path().join("src/librustdoc/html/static/css/noscript.css"))
+            .unwrap();
+
+    let mut test_content = String::new();
+    let mut found_begin_light = false;
+    for line in no_script.split('\n') {
+        if line == "/* Begin theme: light */" {
+            found_begin_light = true;
+        } else if line == "/* End theme: light */" {
+            break;
+        } else if found_begin_light {
+            test_content.push_str(line);
+            test_content.push('\n');
+        }
+    }
+    assert!(!test_content.is_empty());
+    std::fs::create_dir_all(&out_dir).unwrap();
+    std::fs::write(&test_css, test_content).unwrap();
+
+    rustdoc().output(&out_dir).input("foo.rs").arg("--theme").arg(&test_css).run();
+    htmldocck().arg(out_dir).arg("foo.rs").status().unwrap().success();
+}