diff --git a/compiler/erg_common/build.rs b/compiler/erg_common/build.rs
index c4f10cb8..96a481b1 100644
--- a/compiler/erg_common/build.rs
+++ b/compiler/erg_common/build.rs
@@ -8,7 +8,7 @@ fn main() -> std::io::Result<()> {
         .args(&["rev-parse", "--short", "HEAD"])
         .output()
         .expect("failed to get the git hash");
-    let git_hash_short = String::from_utf8(output.stdout).unwrap();
+    let git_hash_short = String::from_utf8_lossy(&output.stdout);
     let now = datetime::now();
     println!("cargo:rustc-env=GIT_HASH_SHORT={git_hash_short}");
     println!("cargo:rustc-env=BUILD_DATE={now}");
diff --git a/compiler/erg_common/datetime.rs b/compiler/erg_common/datetime.rs
index a3ec1bc1..df558f0c 100644
--- a/compiler/erg_common/datetime.rs
+++ b/compiler/erg_common/datetime.rs
@@ -13,8 +13,7 @@ pub fn now() -> String {
             .output()
             .expect("failed to execute process to get current time")
     };
-    String::from_utf8(output.stdout.clone())
-        .unwrap_or_else(|_| String::from_utf8_lossy(&output.stdout[..]).to_string())
+    String::from_utf8_lossy(&output.stdout[..])
         .trim_end()
         .to_string()
 }
diff --git a/compiler/erg_common/python_util.rs b/compiler/erg_common/python_util.rs
index 9bc3694d..d551c4e3 100644
--- a/compiler/erg_common/python_util.rs
+++ b/compiler/erg_common/python_util.rs
@@ -87,7 +87,7 @@ pub fn eval_pyc<S: Into<String>>(file: S) -> String {
             .expect("cannot execute python")
     };
     let out = out.wait_with_output().expect("python doesn't work");
-    String::from_utf8(out.stdout).expect("failed to decode python output")
+    String::from_utf8_lossy(&out.stdout).to_string()
 }
 
 pub fn exec_py(code: &str) {