diff --git a/flang/include/flang/Optimizer/.clang-tidy b/flang/include/flang/Optimizer/.clang-tidy
index 9cc942b8870a2..9a0c8a6d4cbfb 100644
--- a/flang/include/flang/Optimizer/.clang-tidy
+++ b/flang/include/flang/Optimizer/.clang-tidy
@@ -1,19 +1,9 @@
 Checks: '-readability-braces-around-statements,readability-identifier-naming,llvm-include-order,clang-diagnostic-*'
 InheritParentConfig: true
 CheckOptions:
-  - key:             readability-identifier-naming.ClassCase
-    value:           CamelCase
-  - key:             readability-identifier-naming.EnumCase
-    value:           CamelCase
-  - key:             readability-identifier-naming.FunctionCase
-    value:           camelBack
   - key:             readability-identifier-naming.MemberCase
     value:           camelBack
   - key:             readability-identifier-naming.ParameterCase
     value:           camelBack
-  - key:             readability-identifier-naming.UnionCase
-    value:           CamelCase
   - key:             readability-identifier-naming.VariableCase
     value:           camelBack
-  - key:             readability-identifier-naming.IgnoreMainLikeFunctions
-    value:           1
diff --git a/flang/lib/Optimizer/.clang-tidy b/flang/lib/Optimizer/.clang-tidy
index 9cc942b8870a2..9a0c8a6d4cbfb 100644
--- a/flang/lib/Optimizer/.clang-tidy
+++ b/flang/lib/Optimizer/.clang-tidy
@@ -1,19 +1,9 @@
 Checks: '-readability-braces-around-statements,readability-identifier-naming,llvm-include-order,clang-diagnostic-*'
 InheritParentConfig: true
 CheckOptions:
-  - key:             readability-identifier-naming.ClassCase
-    value:           CamelCase
-  - key:             readability-identifier-naming.EnumCase
-    value:           CamelCase
-  - key:             readability-identifier-naming.FunctionCase
-    value:           camelBack
   - key:             readability-identifier-naming.MemberCase
     value:           camelBack
   - key:             readability-identifier-naming.ParameterCase
     value:           camelBack
-  - key:             readability-identifier-naming.UnionCase
-    value:           CamelCase
   - key:             readability-identifier-naming.VariableCase
     value:           camelBack
-  - key:             readability-identifier-naming.IgnoreMainLikeFunctions
-    value:           1