diff --git a/tests/parallel/twrong_refcounts.nim b/tests/parallel/twrong_refcounts.nim
index ac428762d..ed3c1b894 100644
--- a/tests/parallel/twrong_refcounts.nim
+++ b/tests/parallel/twrong_refcounts.nim
@@ -1,7 +1,10 @@
 discard """
   output: "Success"
+  target: "c"
 """
 
+# Note: target: "cpp" fails because we can't yet have `extern "C"` mangling in
+# `exportc` procs.
 import math, random, threadPool
 
 # ---