diff --git a/.cargo/config.toml b/.cargo/config.toml
index 8593d78cd..c6aa20761 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,9 +1,5 @@
-# spell-checker:ignore CFLAGS
-
 [target.x86_64-unknown-redox]
 linker = "x86_64-unknown-redox-gcc"
 
 [env]
 PROJECT_NAME_FOR_VERSION_STRING = "uutils coreutils"
-# TODO remove when there is an onig version > 6.4.0, https://github.com/rust-onig/rust-onig/issues/196
-CFLAGS='-std=gnu17'