diff --git a/tests/vm/tvmmisc.nim b/tests/vm/tvmmisc.nim
index d28f765740e2c..58a5a7eb8050c 100644
--- a/tests/vm/tvmmisc.nim
+++ b/tests/vm/tvmmisc.nim
@@ -355,7 +355,7 @@ block: # bug #8007
 block: # bug #14340
   block:
     proc opl3EnvelopeCalcSin0() = discard
-    type EnvelopeSinfunc = proc()
+    type EnvelopeSinfunc = proc() {.nimcall.} # todo: fixme 
     # const EnvelopeCalcSin0 = opl3EnvelopeCalcSin0 # ok
     const EnvelopeCalcSin0: EnvelopeSinfunc = opl3EnvelopeCalcSin0 # was bug
     const envelopeSin = [EnvelopeCalcSin0]