diff --git a/gitrevise/odb.py b/gitrevise/odb.py
index 15d0c80..a49ee28 100644
--- a/gitrevise/odb.py
+++ b/gitrevise/odb.py
@@ -316,6 +316,8 @@ def new_commit(
                 for line in gpg.stdout.splitlines():
                     body += b" " + line + b"\n"
 
+                if not b"\n[GNUPG:] SIG_CREATED " in gpg.stdout:
+                    raise CalledProcessError()
 
             except CalledProcessError as gpg:
                 print(gpg.stderr.decode(), file=sys.stderr, end="")