diff --git a/gn.spec b/gn.spec
index 536131c..85b5b20 100644
--- a/gn.spec
+++ b/gn.spec
@@ -101,9 +101,6 @@ cp -vp misc/vim/README.md README-vim.md
 # Fix shebangs in examples and such.
 %py3_shebang_fix .
 
-# Stop overriding optimization flags
-sed -r -i '/.append(.-O3.)/d' build/gen.py
-
 
 %build
 # We need to set CC and CXX explicitly before Fedora 33, including on the EPELs.