diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/EnvCommand.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/EnvCommand.java
index 5736ce3..9563f3c 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/EnvCommand.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/EnvCommand.java
@@ -51,7 +51,7 @@ public class EnvCommand extends ChildCommand {
             String lowerCase = args[0].toLowerCase();
             return System.getenv().keySet()
                     .stream()
-                    .filter(o -> o.startsWith(lowerCase))
+                    .filter(o -> o.toLowerCase().startsWith(lowerCase))
                     .collect(Collectors.toList());
         }
         return Collections.emptyList();
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/SystemCommand.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/SystemCommand.java
index 6d6b415..63fbb8e 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/SystemCommand.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/SystemCommand.java
@@ -52,7 +52,7 @@ public class SystemCommand extends ChildCommand {
             return System.getProperties().keySet()
                     .stream()
                     .map(Object::toString)
-                    .filter(o -> o.startsWith(lowerCase))
+                    .filter(o -> o.toLowerCase().startsWith(lowerCase))
                     .collect(Collectors.toList());
         }
         return Collections.emptyList();