diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index e87950b36d9df..74592424337ad 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -252,7 +252,6 @@ run-make/rustdoc-scrape-examples-ordering/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-shared-flags/Makefile
 run-make/rustdoc-target-spec-json-path/Makefile
 run-make/rustdoc-themes/Makefile
 run-make/rustdoc-verify-output-files/Makefile
diff --git a/tests/run-make/rustdoc-shared-flags/Makefile b/tests/run-make/rustdoc-shared-flags/Makefile
deleted file mode 100644
index a2a7d7b3634a9..0000000000000
--- a/tests/run-make/rustdoc-shared-flags/Makefile
+++ /dev/null
@@ -1,18 +0,0 @@
-include ../tools.mk
-
-all: z_help c_help list_passes
-
-c_help:
-	$(RUSTC) -C help > $(TMPDIR)/rustc.c_help.txt
-	$(RUSTDOC) -C help > $(TMPDIR)/rustdoc.c_help.txt
-	$(DIFF) $(TMPDIR)/rustc.c_help.txt $(TMPDIR)/rustdoc.c_help.txt
-
-z_help:
-	$(RUSTC) -Z help > $(TMPDIR)/rustc.z_help.txt
-	$(RUSTDOC) -Z help > $(TMPDIR)/rustdoc.z_help.txt
-	$(DIFF) $(TMPDIR)/rustc.z_help.txt $(TMPDIR)/rustdoc.z_help.txt
-
-list_passes:
-	$(RUSTC) -C passes=list > $(TMPDIR)/rustc.passes.txt
-	$(RUSTDOC) -C passes=list > $(TMPDIR)/rustdoc.passes.txt
-	$(DIFF) $(TMPDIR)/rustc.passes.txt $(TMPDIR)/rustdoc.passes.txt
diff --git a/tests/run-make/rustdoc-shared-flags/rmake.rs b/tests/run-make/rustdoc-shared-flags/rmake.rs
new file mode 100644
index 0000000000000..2db613f781764
--- /dev/null
+++ b/tests/run-make/rustdoc-shared-flags/rmake.rs
@@ -0,0 +1,14 @@
+use run_make_support::{rustc, rustdoc, Diff};
+
+fn compare_outputs(args: &[&str]) {
+    let rustc_output = String::from_utf8(rustc().args(args).command_output().stdout).unwrap();
+    let rustdoc_output = String::from_utf8(rustdoc().args(args).command_output().stdout).unwrap();
+
+    Diff::new().expected_text("rustc", rustc_output).actual_text("rustdoc", rustdoc_output).run();
+}
+
+fn main() {
+    compare_outputs(&["-C", "help"]);
+    compare_outputs(&["-Z", "help"]);
+    compare_outputs(&["-C", "passes=list"]);
+}