diff --git a/hy/compiler.py b/hy/compiler.py
index 2963496..7638893 100755
--- a/hy/compiler.py
+++ b/hy/compiler.py
@@ -1061,7 +1061,7 @@ class HyASTCompiler(object):
                 expr,
                 name=fname,
                 args=ast.arguments(
-                    args=[], vararg=None, kwarg=None,
+                    args=[], vararg=None, kwarg=None, posonlyargs=[],
                     kwonlyargs=[], kw_defaults=[], defaults=[]),
                 body=f(parts).stmts,
                 decorator_list=[])
@@ -1425,6 +1425,7 @@ class HyASTCompiler(object):
         args = ast.arguments(
             args=main_args, defaults=defaults,
             vararg=rest,
+            posonlyargs=[],
             kwonlyargs=kwonly, kw_defaults=kw_defaults,
             kwarg=kwargs)
 
diff --git a/hy/macros.py b/hy/macros.py
index 3c91f11..66fc3ff 100644
--- a/hy/macros.py
+++ b/hy/macros.py
@@ -9,7 +9,7 @@ import traceback
 
 from contextlib import contextmanager
 
-from hy._compat import reraise
+from hy._compat import reraise, PY38
 from hy.models import replace_hy_obj, HyExpression, HySymbol, wrap_value
 from hy.lex import mangle
 from hy.errors import (HyLanguageError, HyMacroExpansionError, HyTypeError,
@@ -398,7 +398,8 @@ def rename_function(func, new_name):
 
     return _fn
 
-code_obj_args = ['argcount', 'kwonlyargcount', 'nlocals', 'stacksize',
-                 'flags', 'code', 'consts', 'names', 'varnames',
-                 'filename', 'name', 'firstlineno', 'lnotab', 'freevars',
-                 'cellvars']
+code_obj_args = ['argcount', 'posonlyargcount', 'kwonlyargcount', 'nlocals', 'stacksize',
+                 'flags', 'code', 'consts', 'names', 'varnames', 'filename', 'name',
+                 'firstlineno', 'lnotab', 'freevars', 'cellvars']
+if not PY38:
+    code_obj_args.remove("posonlyargcount")