diff --git a/crypto.c b/crypto.c
index 600fbb8..b9f55db 100644
--- a/crypto.c
+++ b/crypto.c
@@ -1191,6 +1191,9 @@ fp_pub_determine_outcome (struct BRANDT_Auction *ad,
 	dlogi = GNUNET_CRYPTO_ecc_dlog (ec_dlogctx, sum_gamma);
 	brandt_assert (dlogi > 0);
 
+	/* all bidders participated with a multiplicative share */
+	dlogi /= ad->n;
+
 	/* can only support up to bits(dlogi) bidders */
 	brandt_assert (sizeof (int) * 8 - 1 >= ad->n);
 	for (uint16_t i = 0; i < ad->n; i++)