diff --git a/src/wormhole/cli/welcome.py b/src/wormhole/cli/welcome.py
index f763eae..50a60a4 100644
--- a/src/wormhole/cli/welcome.py
+++ b/src/wormhole/cli/welcome.py
@@ -10,9 +10,9 @@ class CLIWelcomeHandler(_WelcomeHandler):
 
     def handle_welcome(self, welcome):
         # Only warn if we're running a release version (e.g. 0.0.6, not
-        # 0.0.6-DISTANCE-gHASH). Only warn once.
+        # 0.0.6+DISTANCE.gHASH). Only warn once.
         if ("current_cli_version" in welcome
-            and "-" not in self._current_version
+            and "+" not in self._current_version
             and not self._version_warning_displayed
             and welcome["current_cli_version"] != self._current_version):
             print("Warning: errors may occur unless both sides are running the same version", file=self.stderr)
diff --git a/src/wormhole/test/test_cli.py b/src/wormhole/test/test_cli.py
index fb8fd10..086f18c 100644
--- a/src/wormhole/test/test_cli.py
+++ b/src/wormhole/test/test_cli.py
@@ -932,7 +932,7 @@ class Welcome(unittest.TestCase):
 
     def test_version_unreleased(self):
         stderr = self.do({"current_cli_version": "3.0"},
-                         my_version="2.5-middle-something")
+                         my_version="2.5+middle.something")
         self.assertEqual(stderr, "")
 
     def test_motd(self):