diff --git a/etc/git/gitconfig b/etc/git/gitconfig
index 654a630b18..9c7827ced2 100644
--- a/etc/git/gitconfig
+++ b/etc/git/gitconfig
@@ -20,6 +20,7 @@
 [b4]
         attestation-check-dkim = off
         attestation-policy = off
+        shazam-am-flags = --signoff --3way
         linkmask = https://yhetil.org/guix/%s
         linktrailermask = https://yhetil.org/guix/%s
         midmask = https://yhetil.org/guix/%s