diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 63de8ea65..dabfe1f95 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -53,6 +53,8 @@ jobs:
           make -C build bin/jitperf
           export ASAN_OPTIONS=detect_leaks=0    # XXX: remove this
           ./build/bin/jitperf -L build/lib/ test/perf/simple.vhd
+      - name: Check for orphan tests
+        run: make -C build orphan-tests
       - name: Coverage report
         run: make -C build cov-generate
       - name: Coveralls
diff --git a/test/Makemodule.am b/test/Makemodule.am
index 53bd83b87..c58dde96b 100644
--- a/test/Makemodule.am
+++ b/test/Makemodule.am
@@ -165,6 +165,18 @@ update-test-dist:
 	    'test/*.gtkw' 'test/*.tcl' 'test/*.v' \
 	    | sort | sed -e 's/^/\t/' -e '$$ ! s/$$/ \\/' ; \
 	) > $(top_srcdir)/test/dist.mk
+
+orphan-tests:
+	( \
+	  cd $(top_srcdir) ; \
+	  missing=$$(comm -23 \
+	    <(git ls-files -- 'test/regress/*.vhd' 'test/regress/*.v' \
+	       | sed 's|.*/\([[:alnum:]]*\)\..*|\1|' | sort | uniq) \
+	    <(cut -d' ' -f1 test/regress/testlist.txt | sort) \
+	    | tee /dev/stderr | wc -l) ; \
+	  [ "$$missing" = 0 ] || exit 1 ; \
+	)
+
 endif
 
 .PHONY: update-test-dist
diff --git a/test/regress/testlist.txt b/test/regress/testlist.txt
index a9ba61398..0ba80a4c1 100644
--- a/test/regress/testlist.txt
+++ b/test/regress/testlist.txt
@@ -849,3 +849,4 @@ issue750        normal,2008
 order3          shell
 driver18        normal,2008
 vhpi9           normal,vhpi
+issue730        normal,2008
diff --git a/tools/orphan-tests.rb b/tools/orphan-tests.rb
deleted file mode 100755
index cf13b9b0e..000000000
--- a/tools/orphan-tests.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env ruby
-
-#
-# Find any tests in test/regress that are not in testlist.txt
-#
-
-require 'rubygems'
-require 'pathname'
-
-ScriptDir = Pathname.new(__FILE__).realpath.dirname
-TestDir   = ScriptDir + "../test/regress"
-
-have = File.open(TestDir + "testlist.txt").each_line.collect do |l|
-  l.split(/ /)[0]
-end
-
-files = Dir.glob(TestDir + "*.vhd").collect do |f|
-  name = File.basename(f).gsub(/\.vhd/, '')
-  puts "missing #{name}" unless have.any? { |s| s == name }
-end