diff --git a/Lib/compiler/pyassem.py b/Lib/compiler/pyassem.py
index f52f7d0..b82073e 100644
--- a/Lib/compiler/pyassem.py
+++ b/Lib/compiler/pyassem.py
@@ -581,7 +581,7 @@
 
 def twobyte(val):
     """Convert an int argument into high and low bytes"""
-    assert isinstance(val, int)
+    assert isinstance(val, (int, long))
     return divmod(val, 256)
 
 class LineAddrTable:
diff --git a/Lib/compiler/transformer.py b/Lib/compiler/transformer.py
index d4f4613..ba5c03c 100644
--- a/Lib/compiler/transformer.py
+++ b/Lib/compiler/transformer.py
@@ -1526,7 +1526,7 @@
 def debug_tree(tree):
     l = []
     for elt in tree:
-        if isinstance(elt, int):
+        if isinstance(elt, (int, long)):
             l.append(_names.get(elt, elt))
         elif isinstance(elt, str):
             l.append(elt)