diff --git a/bncurve.nimble b/bncurve.nimble
index 3015eed..00497b9 100644
--- a/bncurve.nimble
+++ b/bncurve.nimble
@@ -11,9 +11,13 @@ requires "nim > 0.18.0",
          "nimcrypto"
 
 task test, "Run all tests":
-  exec "nim c -f -r -d:release tests/tarith"
-  exec "nim c -f -r -d:release tests/tfields"
-  exec "nim c -f -r -d:release tests/tgroups"
-  exec "nim c -f -r -d:release tests/tpairing"
-  exec "nim c -f -r -d:release tests/tether"
-  exec "nim c -f -r -d:release tests/tvectors"
+  for tprog in @[
+      "tests/tarith",
+      "tests/tfields",
+      "tests/tgroups",
+      "tests/tpairing",
+      "tests/tether",
+      "tests/tvectors",
+    ]:
+    exec "nim c -f -r -d:release --threads:on " & tprog
+