diff --git a/build_system/utils.rs b/build_system/utils.rs
index 48da64906e2a..c627af4e62fe 100644
--- a/build_system/utils.rs
+++ b/build_system/utils.rs
@@ -104,5 +104,5 @@ pub(crate) fn copy_dir_recursively(from: &Path, to: &Path) {
 }
 
 pub(crate) fn is_ci() -> bool {
-    env::var("CI").as_ref().map(|val| &**val) == Ok("true")
+    env::var("CI").as_deref() == Ok("true")
 }
diff --git a/src/config.rs b/src/config.rs
index e59a0cb0a232..45522fb1a4ca 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -2,7 +2,7 @@ use std::env;
 use std::str::FromStr;
 
 fn bool_env_var(key: &str) -> bool {
-    env::var(key).as_ref().map(|val| &**val) == Ok("1")
+    env::var(key).as_deref() == Ok("1")
 }
 
 /// The mode to use for compilation.