diff --git a/cython.nanorc b/cython.nanorc
index 14cb500..bca84b4 100644
--- a/cython.nanorc
+++ b/cython.nanorc
@@ -1,6 +1,6 @@
 ## Cython nanorc, based off of Python nanorc.
 ##
-syntax "cython" "\.pyx$" "\.pyd$" "\.pyi$"
+syntax "cython" "\.pyx$" "\.pxd$" "\.pyi$"
 icolor brightred "def [ 0-9A-Z_]+"
 icolor brightred "cpdef [ 0-9A-Z_]+"
 icolor brightred "cdef cppclass [ 0-9A-Z_]+"