diff --git a/crates/nu-protocol/src/engine/engine_state.rs b/crates/nu-protocol/src/engine/engine_state.rs
index 768eab28d7..0d261355f9 100644
--- a/crates/nu-protocol/src/engine/engine_state.rs
+++ b/crates/nu-protocol/src/engine/engine_state.rs
@@ -14,6 +14,7 @@ use crate::{
 use fancy_regex::Regex;
 use lru::LruCache;
 use nu_path::AbsolutePathBuf;
+use nu_utils::IgnoreCaseExt;
 use std::{
     collections::HashMap,
     num::NonZeroUsize,
@@ -466,15 +467,10 @@ impl EngineState {
     }
 
     pub fn get_env_var_insensitive(&self, name: &str) -> Option<&Value> {
-        let name_lower = name.to_lowercase();
-
         for overlay_id in self.scope.active_overlays.iter().rev() {
             let overlay_name = String::from_utf8_lossy(self.get_overlay_name(*overlay_id));
             if let Some(env_vars) = self.env_vars.get(overlay_name.as_ref()) {
-                if let Some(v) = env_vars
-                    .iter()
-                    .find(|(k, _)| k.to_lowercase() == name_lower)
-                {
+                if let Some(v) = env_vars.iter().find(|(k, _)| k.eq_ignore_case(name)) {
                     return Some(v.1);
                 }
             }
diff --git a/crates/nu-protocol/src/engine/stack.rs b/crates/nu-protocol/src/engine/stack.rs
index 76e28180df..be424c526f 100644
--- a/crates/nu-protocol/src/engine/stack.rs
+++ b/crates/nu-protocol/src/engine/stack.rs
@@ -5,6 +5,7 @@ use crate::{
     },
     Config, IntoValue, OutDest, ShellError, Span, Value, VarId, ENV_VARIABLE_ID, NU_VARIABLE_ID,
 };
+use nu_utils::IgnoreCaseExt;
 use std::{
     collections::{HashMap, HashSet},
     fs::File,
@@ -485,15 +486,10 @@ impl Stack {
         engine_state: &'a EngineState,
         name: &str,
     ) -> Option<&'a Value> {
-        let name_lower = name.to_lowercase();
-
         for scope in self.env_vars.iter().rev() {
             for active_overlay in self.active_overlays.iter().rev() {
                 if let Some(env_vars) = scope.get(active_overlay) {
-                    if let Some(v) = env_vars
-                        .iter()
-                        .find(|(k, _)| k.to_lowercase() == name_lower)
-                    {
+                    if let Some(v) = env_vars.iter().find(|(k, _)| k.eq_ignore_case(name)) {
                         return Some(v.1);
                     }
                 }
@@ -502,17 +498,14 @@ impl Stack {
 
         for active_overlay in self.active_overlays.iter().rev() {
             let is_hidden = if let Some(env_hidden) = self.env_hidden.get(active_overlay) {
-                env_hidden.iter().any(|k| k.to_lowercase() == name_lower)
+                env_hidden.iter().any(|k| k.eq_ignore_case(name))
             } else {
                 false
             };
 
             if !is_hidden {
                 if let Some(env_vars) = engine_state.env_vars.get(active_overlay) {
-                    if let Some(v) = env_vars
-                        .iter()
-                        .find(|(k, _)| k.to_lowercase() == name_lower)
-                    {
+                    if let Some(v) = env_vars.iter().find(|(k, _)| k.eq_ignore_case(name)) {
                         return Some(v.1);
                     }
                 }