diff --git a/src/oebuild/util.py b/src/oebuild/util.py
index 576bf7d601897f2778d32b292e36960dc4366f0d..4a48f57df4561f40ad07b28a82409725577dfd04 100644
--- a/src/oebuild/util.py
+++ b/src/oebuild/util.py
@@ -246,17 +246,12 @@ def get_host_proxy(proxy_name):
         return host_proxy
 
     for name in proxy_name:
-        command = "env | grep %s | awk -F'=' '{print$NF}'" % name
-        res = subprocess.run(command,
-                             shell=True,
-                             capture_output=True,
-                             encoding="utf-8",
-                             check=False)
-        if res.returncode != 0:
-            logger.error("get proxy variable failed")
-            sys.exit(res.returncode)
-        value = res.stdout.strip()
-        if value != "":
+        command = f"env | grep {name} | awk -F'=' '{{print$NF}}'"
+        try:
+            value = subprocess.check_output(command, shell=True, encoding="utf-8").strip()
             host_proxy[name] = value
+        except subprocess.CalledProcessError as e:
+            logger.error("get proxy variable failed")
+            sys.exit(e.returncode)
 
     return host_proxy