diff --git a/compiler/condsyms.nim b/compiler/condsyms.nim
index a2d8b35641..238dbf5c79 100644
--- a/compiler/condsyms.nim
+++ b/compiler/condsyms.nim
@@ -136,5 +136,7 @@ proc initDefines*() =
   declareSymbol("emulatedthreadvars")
   if platform.OS[targetOS].props.contains(ospLacksThreadVars):
     defineSymbol("emulatedthreadvars")
-  if isDefined("posix"):
+  case targetOS
+  of osSolaris, osNetbsd, osFreebsd, osOpenbsd, osMacosx:
     defineSymbol("nimRawSetjmp")
+  else: discard