diff --git a/gn-0153d369-no-O3.patch b/gn-0153d369-no-O3.patch
new file mode 100644
index 0000000..13a4820
--- /dev/null
+++ b/gn-0153d369-no-O3.patch
@@ -0,0 +1,14 @@
+diff -Naur gn-0153d369bbccc908f4da4993b1ba82728055926a-original/build/gen.py gn-0153d369bbccc908f4da4993b1ba82728055926a/build/gen.py
+--- gn-0153d369bbccc908f4da4993b1ba82728055926a-original/build/gen.py	2021-09-27 14:58:14.000000000 -0400
++++ gn-0153d369bbccc908f4da4993b1ba82728055926a/build/gen.py	2021-09-27 15:59:42.330405195 -0400
+@@ -344,10 +344,8 @@
+       cflags.extend(['-O0', '-g'])
+     else:
+       cflags.append('-DNDEBUG')
+-      cflags.append('-O3')
+       if options.no_strip:
+         cflags.append('-g')
+-      ldflags.append('-O3')
+       # Use -fdata-sections and -ffunction-sections to place each function
+       # or data item into its own section so --gc-sections can eliminate any
+       # unused functions and data items.
diff --git a/gn.spec b/gn.spec
index 453c869..453d6c2 100644
--- a/gn.spec
+++ b/gn.spec
@@ -53,6 +53,8 @@ Source2:        update-version
 #     ce30313f5e4af121140c037bf026453355534f24/f/
 #     chromium-84.0.4147.105-gn-gcc-cleanup.patch
 Patch0:         %{name}-39a87c0b-gcc-cleanup.patch
+# Stop overriding optimization flags
+Patch1:         %{name}-0153d369-no-O3.patch
 
 BuildRequires:  python3
 BuildRequires:  python3-devel
@@ -100,9 +102,6 @@ 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
 AR='gcc-ar'; export AR