diff --git a/src/ArduinoJson/StringStorage/StringCopier.hpp b/src/ArduinoJson/StringStorage/StringCopier.hpp
index 8b1104b4..80670aad 100644
--- a/src/ArduinoJson/StringStorage/StringCopier.hpp
+++ b/src/ArduinoJson/StringStorage/StringCopier.hpp
@@ -55,8 +55,12 @@ class StringCopier {
 
  private:
   MemoryPool* _pool;
+
+  // These fields aren't initialized by the constructor but startString()
+  //
+  // NOLINTNEXTLINE(clang-analyzer-optin.cplusplus.UninitializedObject)
   char* _ptr;
-  size_t _size;
-  size_t _capacity;
+  // NOLINTNEXTLINE(clang-analyzer-optin.cplusplus.UninitializedObject)
+  size_t _size, _capacity;
 };
 }  // namespace ARDUINOJSON_NAMESPACE