diff --git a/contrib/guix/guix-attest b/contrib/guix/guix-attest
index fbb4b73c71..78c6a83fe6 100755
--- a/contrib/guix/guix-attest
+++ b/contrib/guix/guix-attest
@@ -154,7 +154,7 @@ for outdir in "${OUTDIRS[@]}"; do
             fi
         )
         echo "${outname}: Signing SHA256SUMS to produce SHA256SUMS.asc"
-        gpg --detach-sign --local-user "$gpg_key_name" --output "$outsigdir"/SHA256SUMS.asc "$outsigdir"/SHA256SUMS
+        gpg --detach-sign --local-user "$gpg_key_name" --armor --output "$outsigdir"/SHA256SUMS.asc "$outsigdir"/SHA256SUMS
         echo ""
     fi
 done