diff --git a/sagemath.spec b/sagemath.spec
index 88e8b17..f68e3a5 100644
--- a/sagemath.spec
+++ b/sagemath.spec
@@ -17,7 +17,7 @@
 %bcond_without sphinx_hack
 
 # use workaround to match upstream sagemath patched cython
-%bcond_without cython_hack
+%bcond_with cython_hack
 
 %ifarch x86_64
 %bcond_without fes