diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..97007d9
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,43 @@
+# -*- mode: conf; fill-column: 100; -*-
+# Written for clang-tidy 9.
+
+---
+Checks:         '*,
+                -cppcoreguidelines-non-private-member-variables-in-classes,
+                -fuchsia-default-arguments-calls,
+                -fuchsia-default-arguments-declarations,
+                -fuchsia-default-arguments,
+                -llvm-include-order,
+                -llvm-header-guard,
+                -misc-non-private-member-variables-in-classes,
+                -fuchsia-overloaded-operator,
+                -cppcoreguidelines-avoid-magic-numbers,
+                -readability-magic-numbers,
+                -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+                -hicpp-no-array-decay,
+                -modernize-avoid-c-arrays,
+                -cppcoreguidelines-avoid-c-arrays,
+                -hicpp-avoid-c-arrays,
+                -google-build-using-namespace,
+                -readability-named-parameter,
+                -google-runtime-references,
+                -hicpp-avoid-goto,
+                -hicpp-vararg,
+                -fuchsia-statically-constructed-objects,
+                -google-readability-todo,
+                -modernize-use-trailing-return-type'
+CheckOptions:   - { key: readability-identifier-naming.ClassCase,             value: CamelCase  }
+                # Clashes with constant private member prefix. (const int _var;)
+                # - { key: readability-identifier-naming.ConstantCase,          value: lower_case }
+                - { key: readability-identifier-naming.EnumCase,              value: lower_case }
+                - { key: readability-identifier-naming.FunctionCase,          value: lower_case }
+                - { key: readability-identifier-naming.MemberCase,            value: lower_case }
+                - { key: readability-identifier-naming.ParameterCase,         value: lower_case }
+                - { key: readability-identifier-naming.PrivateMemberCase,     value: lower_case }
+                - { key: readability-identifier-naming.PrivateMemberPrefix,   value: _          }
+                - { key: readability-identifier-naming.ProtextedMemberCase,   value: lower_case }
+                - { key: readability-identifier-naming.ProtectedMemberPrefix, value: _          }
+                - { key: readability-identifier-naming.StructCase,            value: lower_case }
+                # Clashes with static private member prefix. (static int _var;)
+                # - { key: readability-identifier-naming.VariableCase,          value: lower_case }
+...
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4db25d3..7ab4dba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,6 @@ include(debug_flags)
 if(WITH_CLANG-TIDY)
   set(CMAKE_CXX_CLANG_TIDY
     "clang-tidy"
-    "-p=build"
     "-header-filter=${PROJECT_SOURCE_DIR}"
     "-quiet")
 endif()
diff --git a/include/curl_wrapper.hpp b/include/curl_wrapper.hpp
index f72847e..9fec3b6 100644
--- a/include/curl_wrapper.hpp
+++ b/include/curl_wrapper.hpp
@@ -39,11 +39,11 @@ using std::string_view;
  */
 enum class http_method
 {
-    GET,
-    POST,
-    PATCH,
-    PUT,
-    DELETE
+    GET,                        // NOLINT(readability-identifier-naming)
+    POST,                       // NOLINT(readability-identifier-naming)
+    PATCH,                      // NOLINT(readability-identifier-naming)
+    PUT,                        // NOLINT(readability-identifier-naming)
+    DELETE                      // NOLINT(readability-identifier-naming)
 };
 
 /*!
@@ -172,7 +172,7 @@ protected:
      *
      *  @since  0.1.0
      */
-    mutex buffer_mutex;
+    mutex _buffer_mutex;
 
     /*!
      *  @brief  Make a HTTP request.
diff --git a/src/connection.cpp b/src/connection.cpp
index 1b19833..81297ce 100644
--- a/src/connection.cpp
+++ b/src/connection.cpp
@@ -68,17 +68,17 @@ answer_type Connection::del(const endpoint_variant &endpoint,
 
 string Connection::get_new_stream_contents()
 {
-    buffer_mutex.lock();
+    _buffer_mutex.lock();
     auto &buffer{get_buffer()};
     const string buffer_copy{buffer};
     buffer.clear();
-    buffer_mutex.unlock();
+    _buffer_mutex.unlock();
     return buffer_copy;
 }
 
 vector<event_type> Connection::get_new_events()
 {
-    buffer_mutex.lock();
+    _buffer_mutex.lock();
     auto &buffer{get_buffer()};
     vector<event_type> events;
 
@@ -103,7 +103,7 @@ vector<event_type> Connection::get_new_events()
         buffer.erase(0, endpos);
     }
 
-    buffer_mutex.unlock();
+    _buffer_mutex.unlock();
     return events;
 }
 
diff --git a/src/curl_wrapper.cpp b/src/curl_wrapper.cpp
index 97c519d..bfa59ee 100644
--- a/src/curl_wrapper.cpp
+++ b/src/curl_wrapper.cpp
@@ -280,9 +280,9 @@ size_t CURLWrapper::writer_body(char *data, size_t size, size_t nmemb)
         return 0;
     }
 
-    buffer_mutex.lock();
+    _buffer_mutex.lock();
     _curl_buffer_body.append(data, size * nmemb);
-    buffer_mutex.unlock();
+    _buffer_mutex.unlock();
 
     return size * nmemb;
 }