diff --git a/cssutils/css/__init__.py b/cssutils/css/__init__.py
index 1ad2ecc7..8f8740a5 100644
--- a/cssutils/css/__init__.py
+++ b/cssutils/css/__init__.py
@@ -55,6 +55,7 @@
     'CSSFunction',
     'CSSVariable',
     'MSValue',
+    'CSSCalc',
 ]
 
 from .cssstylesheet import CSSStyleSheet
@@ -87,4 +88,5 @@
     CSSFunction,
     CSSVariable,
     MSValue,
+    CSSCalc,
 )