diff --git a/git_review/cmd.py b/git_review/cmd.py
index 15f31211..b9879c51 100644
--- a/git_review/cmd.py
+++ b/git_review/cmd.py
@@ -984,8 +984,8 @@ def assert_one_change(remote, branch, yes, have_hook):
         use_color = "--color=always"
     else:
         use_color = "--color=never"
-    cmd = ("git log %s --decorate --oneline HEAD --not --remotes=%s" % (
-           use_color, remote))
+    cmd = ("git log %s --decorate --oneline --no-show-signature "
+           "HEAD --not --remotes=%s" % (use_color, remote))
     (status, output) = run_command_status(cmd)
     if status != 0:
         print("Had trouble running %s" % cmd)
diff --git a/releasenotes/notes/fix-show-signatures-5e9c12d43b7051f0.yaml b/releasenotes/notes/fix-show-signatures-5e9c12d43b7051f0.yaml
new file mode 100644
index 00000000..da26d999
--- /dev/null
+++ b/releasenotes/notes/fix-show-signatures-5e9c12d43b7051f0.yaml
@@ -0,0 +1,10 @@
+---
+fixes:
+  - |
+    Git's log.ShowSignature option is now supported. Previously,
+    setting it would confuse git-review into thinking there were
+    twice as many changes to push.
+upgrade:
+  - |
+    Git 2.10.0 or later is required as git-review now needs the
+    ``--no-show-signature`` option for git-log.