diff --git a/mercurial/util.h b/mercurial/util.h
--- a/mercurial/util.h
+++ b/mercurial/util.h
@@ -12,6 +12,7 @@
 
 #define IS_PY3K
 #define PyInt_FromLong PyLong_FromLong
+#define PyInt_AsLong PyLong_AsLong
 
 #endif /* PY_MAJOR_VERSION */