diff --git a/asyncdispatch2.nimble b/asyncdispatch2.nimble
index d7820cdf..54cf1a7b 100644
--- a/asyncdispatch2.nimble
+++ b/asyncdispatch2.nimble
@@ -12,36 +12,46 @@ requires "nim > 0.18.0"
 task test, "Run all tests":
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testsync"
   exec "nim c -r tests/testsync"
+  exec "nim c -r --gc:markAndSweep tests/testsync"
   exec "nim c -r -d:release tests/testsync"
 
+
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testsoon"
   exec "nim c -r tests/testsoon"
+  exec "nim c -r --gc:markAndSweep tests/testsoon"
   exec "nim c -r -d:release tests/testsoon"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testtime"
   exec "nim c -r tests/testtime"
+  exec "nim c -r --gc:markAndSweep tests/testtime"
   exec "nim c -r -d:release tests/testtime"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testfut"
   exec "nim c -r tests/testfut"
+  exec "nim c -r --gc:markAndSweep tests/testfut"
   exec "nim c -r -d:release tests/testfut"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testsignal"
   exec "nim c -r tests/testsignal"
+  exec "nim c -r --gc:markAndSweep tests/testsignal"
   exec "nim c -r -d:release tests/testsignal"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testaddress"
   exec "nim c -r tests/testaddress"
+  exec "nim c -r --gc:markAndSweep tests/testaddress"
   exec "nim c -r -d:release tests/testaddress"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testdatagram"
   exec "nim c -r tests/testdatagram"
+  exec "nim c -r --gc:markAndSweep tests/testdatagram"
   exec "nim c -r -d:release tests/testdatagram"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/teststream"
   exec "nim c -r tests/teststream"
+  exec "nim c -r --gc:markAndSweep tests/teststream"
   exec "nim c -r -d:release tests/teststream"
 
   exec "nim c -r -d:useSysAssert -d:useGcAssert tests/testserver"
   exec "nim c -r tests/testserver"
+  exec "nim c -r --gc:markAndSweep tests/testserver"
   exec "nim c -r -d:release tests/testserver"