diff --git a/drchaos.nimble b/drchaos.nimble
index 2259aa8..498ea90 100644
--- a/drchaos.nimble
+++ b/drchaos.nimble
@@ -24,7 +24,7 @@ proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =
   exec "nim " & lang & " --out:build/" & name & " " & extra_params & " " & srcDir & name & ".nim"
 
 proc test(name: string, srcDir = "tests/", args = "", lang = "c") =
-  buildBinary name, srcDir, "--mm:arc -d:danger"
+  buildBinary name, srcDir, "-d:release"
   # Should ideally run inside build/ because of the artifacts, but cd doesn't work!
   exec "build/" & name & " -max_total_time=3 -runs=10000" & args
 
diff --git a/drchaos/mutator.nim b/drchaos/mutator.nim
index b81dbf8..e1e56ee 100644
--- a/drchaos/mutator.nim
+++ b/drchaos/mutator.nim
@@ -515,8 +515,9 @@ template mutatorImpl(target, mutator, typ: untyped) =
       try:
         FuzzTarget(target)(getInput(x, data))
       finally:
-        # Call Nim's compiler api to report unhandled exceptions.
-        {.emit: "nimTestErrorFlag();".}
+        when compileOption("exceptions", "goto"):
+          # Call Nim's compiler api to report unhandled exceptions.
+          {.emit: "nimTestErrorFlag();".}
 
   proc customMutatorImpl(x: var typ; data: openArray[byte]; maxLen: int;
       r: var Rand): int {.nosan.} =