diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf73d288..0839d765 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,3 +14,4 @@ HEAD
 * Store the strings in the heap
 * Reference-count shared strings
 * Always store `serialized("string")` by copy (#1915)
+* Remove the zero-copy mode of `deserializeJson()` and `deserializeMsgPack()`
diff --git a/extras/tests/JsonDeserializer/input_types.cpp b/extras/tests/JsonDeserializer/input_types.cpp
index 894e210e..7c88be9a 100644
--- a/extras/tests/JsonDeserializer/input_types.cpp
+++ b/extras/tests/JsonDeserializer/input_types.cpp
@@ -10,20 +10,17 @@
 #include "CustomReader.hpp"
 
 using ArduinoJson::detail::sizeofObject;
+using ArduinoJson::detail::sizeofString;
 
 TEST_CASE("deserializeJson(char*)") {
   JsonDocument doc(1024);
 
-  SECTION("should not duplicate strings") {
-    char input[] = "{\"hello\":\"world\"}";
+  char input[] = "{\"hello\":\"world\"}";
 
-    DeserializationError err = deserializeJson(doc, input);
+  DeserializationError err = deserializeJson(doc, input);
 
-    REQUIRE(err == DeserializationError::Ok);
-    CHECK(doc.memoryUsage() == sizeofObject(1));
-    CHECK(doc.as<JsonVariant>().memoryUsage() ==
-          sizeofObject(1));  // issue #1318
-  }
+  REQUIRE(err == DeserializationError::Ok);
+  CHECK(doc.memoryUsage() == sizeofObject(1) + 2 * sizeofString(5));
 }
 
 TEST_CASE("deserializeJson(unsigned char*, unsigned int)") {  // issue #1897
diff --git a/extras/tests/JsonDeserializer/string.cpp b/extras/tests/JsonDeserializer/string.cpp
index 521f4d1c..489dd591 100644
--- a/extras/tests/JsonDeserializer/string.cpp
+++ b/extras/tests/JsonDeserializer/string.cpp
@@ -154,12 +154,6 @@ TEST_CASE("String allocation fails") {
     REQUIRE(spyingAllocator.log() ==
             AllocatorLog() << AllocatorLog::AllocateFail(sizeofString(31)));
   }
-
-  SECTION("Input is const char*") {
-    char hello[] = "\"hello\"";
-    REQUIRE(deserializeJson(doc, hello) == DeserializationError::Ok);
-    REQUIRE(spyingAllocator.log() == AllocatorLog());
-  }
 }
 
 TEST_CASE("Deduplicate values") {
diff --git a/src/ArduinoJson/StringStorage/StringMover.hpp b/src/ArduinoJson/StringStorage/StringMover.hpp
deleted file mode 100644
index 1b53c159..00000000
--- a/src/ArduinoJson/StringStorage/StringMover.hpp
+++ /dev/null
@@ -1,47 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2023, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Namespace.hpp>
-#include <ArduinoJson/Strings/JsonString.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-class StringMover {
- public:
-  StringMover(char* ptr) : writePtr_(ptr) {}
-
-  void startString() {
-    startPtr_ = writePtr_;
-  }
-
-  FORCE_INLINE const char* save() {
-    *writePtr_++ = 0;  // terminator
-    return startPtr_;
-  }
-
-  void append(char c) {
-    *writePtr_++ = c;
-  }
-
-  bool isValid() const {
-    return true;
-  }
-
-  JsonString str() const {
-    writePtr_[0] = 0;  // terminator
-    return JsonString(startPtr_, size(), JsonString::Linked);
-  }
-
-  size_t size() const {
-    return size_t(writePtr_ - startPtr_);
-  }
-
- private:
-  char* writePtr_;
-  char* startPtr_;
-};
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/src/ArduinoJson/StringStorage/StringStorage.hpp b/src/ArduinoJson/StringStorage/StringStorage.hpp
index 0b1f77cc..682f1afb 100644
--- a/src/ArduinoJson/StringStorage/StringStorage.hpp
+++ b/src/ArduinoJson/StringStorage/StringStorage.hpp
@@ -5,7 +5,6 @@
 #pragma once
 
 #include <ArduinoJson/StringStorage/StringCopier.hpp>
-#include <ArduinoJson/StringStorage/StringMover.hpp>
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
@@ -15,10 +14,4 @@ StringCopier makeStringStorage(TInput&, MemoryPool* pool) {
   return StringCopier(pool);
 }
 
-template <typename TChar>
-StringMover makeStringStorage(
-    TChar* input, MemoryPool*,
-    typename enable_if<!is_const<TChar>::value>::type* = 0) {
-  return StringMover(reinterpret_cast<char*>(input));
-}
 ARDUINOJSON_END_PRIVATE_NAMESPACE