diff --git a/tst/testbugfix/2024-Halloween-IsomorphismFp.tst b/tst/testbugfix/2024-Halloween-IsomorphismFp.tst
new file mode 100644
index 0000000000..0ef63f34e6
--- /dev/null
+++ b/tst/testbugfix/2024-Halloween-IsomorphismFp.tst
@@ -0,0 +1,8 @@
+# Fix for bug in IsomorphismFp
+# reported by Andries Brouwer, 10/31/24
+
+gap> G:=PSL(3,7);;
+gap> maxes := MaximalSubgroupClassReps(G);;
+gap> maxes1 := MaximalSubgroupClassReps(maxes[1]);;
+gap> maxes12:= maxes1[2];;
+gap> StructureDescription(maxes12:short);;