diff --git a/mps/test/testsets/conerr b/mps/test/testsets/conerr
index 71ab3d6d29f..b79d1a81d84 100644
--- a/mps/test/testsets/conerr
+++ b/mps/test/testsets/conerr
@@ -66,7 +66,7 @@ conerr/55.c
 conerr/56.c
 % conerr/57.c -- see <code/ld.c#.add.no-arena-check>
 % conerr/58.c -- see <code/ld.c#.stale.no-arena-check>
-conerr/59.c
+% conerr/59.c -- assertion is on critical path
 conerr/60.c
 conerr/61.c
 conerr/62.c
diff --git a/mps/test/testsets/coolonly b/mps/test/testsets/coolonly
index 2246a76619d..ac3e5273e8a 100644
--- a/mps/test/testsets/coolonly
+++ b/mps/test/testsets/coolonly
@@ -45,4 +45,5 @@ conerr/21.c
 conerr/22.c
 conerr/23.c
 conerr/27.c
+conerr/59.c
 function/72.c