diff --git a/asyncdispatch2.nimble b/asyncdispatch2.nimble
index 5d841248..048132a0 100644
--- a/asyncdispatch2.nimble
+++ b/asyncdispatch2.nimble
@@ -10,5 +10,7 @@ skipDirs      = @["tests", "Nim", "nim"]
 requires "nim > 0.18.0"
 
 task test, "Run all tests":
-  exec "nim c -r tests/testdatagram"
-  exec "nim c -r tests/teststream"
+  exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testdatagram"
+  exec "nim c -r -d:useSysAssert -d:useGcAssert tests/teststream"
+  exec "nim c -r -d:release tests/testdatagram"
+  exec "nim c -r -d:release tests/teststream"