diff --git a/Cargo.toml b/Cargo.toml
index 7e8d0b0..0adc7ee 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.6.49"
+version = "0.6.50"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
diff --git a/src/util_env.rs b/src/util_env.rs
index c90ec36..4809d70 100644
--- a/src/util_env.rs
+++ b/src/util_env.rs
@@ -1,11 +1,11 @@
 use std::env;
 
 pub fn is_env_on(var: &str) -> bool {
-    env::var(var).ok().map(|val| is_on(&val)).unwrap_or(false)
+    env_var(var).map(|val| is_on(&val)).unwrap_or(false)
 }
 
 pub fn is_env_off(var: &str) -> bool {
-    env::var(var).ok().map(|val| is_off(&val)).unwrap_or(false)
+    env_var(var).map(|val| is_off(&val)).unwrap_or(false)
 }
 
 pub fn is_on(val: &str) -> bool {