diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/command/CompositeCommandInternal.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/command/CompositeCommandInternal.kt
index 743126efd..888bbc624 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/command/CompositeCommandInternal.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/command/CompositeCommandInternal.kt
@@ -297,8 +297,8 @@ internal fun AbstractReflectionCommand.createSubCommand(
         subCommandAnnotationResolver.getSubCommandNames(this, function)
             .let { namesFromAnnotation ->
                 if (namesFromAnnotation.isNotEmpty()) {
-                    namesFromAnnotation
-                } else arrayOf(function.name)
+                    namesFromAnnotation.map(String::toLowerCase).toTypedArray()
+                } else arrayOf(function.name.toLowerCase())
             }.also { names ->
                 names.forEach {
                     check(it.isValidSubName()) {