diff --git a/Lib/fontTools/qu2cu/qu2cu.py b/Lib/fontTools/qu2cu/qu2cu.py
index 9eb3713c4..9e1781992 100644
--- a/Lib/fontTools/qu2cu/qu2cu.py
+++ b/Lib/fontTools/qu2cu/qu2cu.py
@@ -37,7 +37,7 @@ else:
 
 
 # Copied from cu2qu
-#@cython.cfunc
+# @cython.cfunc
 @cython.returns(cython.int)
 @cython.locals(
     tolerance=cython.double,