diff --git a/pyproject.toml b/pyproject.toml
index e68dabd7..873057c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,10 +113,9 @@ norecursedirs = [
     "numcodecs.egg-info",
 ]
 [tool.cibuildwheel]
- environment = { DISABLE_NUMCODECS_AVX2=1 }
- [tool.cibuildwheel.macos]
- environment = { MACOSX_DEPLOYMENT_TARGET=10.9, CFLAGS="$CFLAGS -Wno-implicit-function-declaration" }
- [[tool.cibuildwheel.overrides]]
- select = "*-macosx_arm64"
- environment = { DISABLE_NUMCODECS_SSE2=1 }
- 
+environment = { DISABLE_NUMCODECS_AVX2=1 }
+[tool.cibuildwheel.macos]
+environment = { MACOSX_DEPLOYMENT_TARGET=10.9, DISABLE_NUMCODECS_AVX2=1, CFLAGS="$CFLAGS -Wno-implicit-function-declaration" }
+[[tool.cibuildwheel.overrides]]
+select = "*-macosx_arm64"
+environment = { DISABLE_NUMCODECS_SSE2=1 }