diff --git a/tests/suites/test_suite_bignum_core.misc.data b/tests/suites/test_suite_bignum_core.misc.data
index d4cf00f893..5d3c6753ce 100644
--- a/tests/suites/test_suite_bignum_core.misc.data
+++ b/tests/suites/test_suite_bignum_core.misc.data
@@ -530,6 +530,11 @@ mpi_core_gcd_modinv_odd:"e4518a1900fce698fa3":"1a84113636607520200d":"3":""
 GCD-modinv random 80-bit, trivial GCD -> inverse
 mpi_core_gcd_modinv_odd:"7f2405d6de7db80a7bc":"1a84113636607520200d":"1":"15f158844a59cd7a3ed2"
 
+# This data results in the gcd-modinv loop converging to its final state
+# only in the last iteration. See python script in commit message.
+GCD-modinv (almost) max iterations
+mpi_core_gcd_modinv_odd:"8000000000000000":"b26eb5721a2cb24c36acb4550b176671":"1":"77e1dd63583a6b3c8deefe7737862c89"
+
 Div2 mod odd: even value
 mpi_core_div2_mod_odd:"4":"7":"2"