diff --git a/build-aux/git-authenticate.scm b/build-aux/git-authenticate.scm
index aa9103a372..8d05f0ee40 100644
--- a/build-aux/git-authenticate.scm
+++ b/build-aux/git-authenticate.scm
@@ -134,7 +134,8 @@
     ("lsl88"
      "2AE3 1395 932B E642 FC0E  D99C 9BED 6EDA 32E5 B0BC")
     ("mab"
-     "BE62 7373 8E61 6D6D 1B3A  08E8 A21A 0202 4881 6103")
+     ;; primary: "BE62 7373 8E61 6D6D 1B3A  08E8 A21A 0202 4881 6103"
+     "39B3 3C8D 9448 0D2D DCC2  A498 8B44 A0CD C7B9 56F2")
     ("marusich"
      "CBF5 9755 CBE7 E7EF EF18  3FB1 DD40 9A15 D822 469D")
     ("mbakke"