diff --git a/.clang-tidy b/.clang-tidy
index 38256bd..0bf82bc 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -46,7 +46,6 @@ CheckOptions:
   readability-identifier-naming.GlobalVariablePrefix: 'global_'
   readability-identifier-naming.MemberPrefix: 'm_'
   readability-identifier-naming.PrivateMemberPrefix: 'm_'
-  readability-identifier-naming.PrivateMemberPrefix: 'm_'
   readability-identifier-naming.ProtectedMemberPrefix: 'm_'
   readability-identifier-naming.PublicMemberPrefix: ''
   readability-identifier-naming.StaticConstantPrefix: 'static_'