diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -927,7 +927,6 @@
         extraconfigopts=None,
         shell=None,
         hgcommand=None,
-        rhgcommand=None,
         slowtimeout=None,
         usechg=False,
         chgdebug=False,
@@ -985,9 +984,6 @@
         self._extraconfigopts = extraconfigopts or []
         self._shell = _sys2bytes(shell)
         self._hgcommand = hgcommand or b'hg'
-        self._rhgcommand = rhgcommand or _sys2bytes(
-            os.path.abspath('./rust/target/release/rhg')
-        )
         self._usechg = usechg
         self._chgdebug = chgdebug
         self._useipv6 = useipv6
@@ -1758,8 +1754,6 @@
             script.append(b'set -x\n')
         if self._hgcommand != b'hg':
             script.append(b'alias hg="%s"\n' % self._hgcommand)
-        if self._rhgcommand != b'rhg':
-            script.append(b'alias rhg="%s"\n' % self._rhgcommand)
         if os.getenv('MSYSTEM'):
             script.append(b'alias pwd="pwd -W"\n')
 
@@ -2956,7 +2950,6 @@
         self._coveragefile = None
         self._createdfiles = []
         self._hgcommand = None
-        self._rhgcommand = None
         self._hgpath = None
         self._portoffset = 0
         self._ports = {}
diff --git a/tests/test-rhg.t b/tests/test-rhg.t
--- a/tests/test-rhg.t
+++ b/tests/test-rhg.t
@@ -1,3 +1,13 @@
+#require rust
+
+  $ rhg() {
+  > if [ -f "$RUNTESTDIR/../rust/target/debug/rhg" ]; then
+  >   "$RUNTESTDIR/../rust/target/debug/rhg" "$@"
+  > else
+  >   echo "skipped: Cannot find rhg. Try to run cargo build in rust/rhg."
+  >   exit 80
+  > fi
+  > }
   $ rhg unimplemented-command
   [252]
   $ rhg root