diff --git a/src/helper/jim.c b/src/helper/jim.c
index ad2d6ec5c..f0d17525a 100644
--- a/src/helper/jim.c
+++ b/src/helper/jim.c
@@ -11984,7 +11984,7 @@ static int Jim_EnvCoreCommand(Jim_Interp *interp, int argc,
 
     if (argc == 1) {
 
-#ifndef HAVE_UNISTD_H
+#if ! HAVE_UNISTD_H || IS_DARWIN
         extern char **environ;
 #endif