diff --git a/libplist.spec b/libplist.spec
index 15884fb..e3b8f5d 100644
--- a/libplist.spec
+++ b/libplist.spec
@@ -46,7 +46,6 @@ Requires: python3
 
 %prep
 %setup -q
-sed -i 's/\[cython\]/[cython3]/' m4/ac_pkg_cython.m4
 ACLOCAL="aclocal -I m4" autoreconf -f -i
 
 %build