diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10e46293..7d05cb89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ArduinoJson: change log
 =======================
 
+HEAD
+----
+
+* Fix truncated strings on Arduino Due (issue #2181)
+
 v7.4.1 (2025-04-11)
 ------
 
diff --git a/extras/tests/Misc/CMakeLists.txt b/extras/tests/Misc/CMakeLists.txt
index 05be1ca8..66afc4f7 100644
--- a/extras/tests/Misc/CMakeLists.txt
+++ b/extras/tests/Misc/CMakeLists.txt
@@ -29,3 +29,23 @@ set_tests_properties(Misc
 	PROPERTIES
 		LABELS "Catch"
 )
+
+add_executable(Issue2181
+	issue2181.cpp # Cannot be linked with other tests
+)
+
+set_target_properties(Issue2181 PROPERTIES UNITY_BUILD OFF)
+
+add_test(Issue2181 Issue2181)
+
+set_tests_properties(Issue2181
+	PROPERTIES
+		LABELS "Catch"
+)
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+	target_compile_options(Issue2181
+		PRIVATE
+			-Wno-keyword-macro # keyword is hidden by macro definition
+	)
+endif()
diff --git a/extras/tests/Misc/issue2181.cpp b/extras/tests/Misc/issue2181.cpp
new file mode 100644
index 00000000..73929137
--- /dev/null
+++ b/extras/tests/Misc/issue2181.cpp
@@ -0,0 +1,15 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#define true 0x1
+#define false 0x0
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("Issue #2181") {
+  JsonDocument doc;
+  doc["hello"] = "world";
+  REQUIRE(doc.as<std::string>() == "{\"hello\":\"world\"}");
+}
diff --git a/src/ArduinoJson.hpp b/src/ArduinoJson.hpp
index 5818de3f..b3e71d35 100644
--- a/src/ArduinoJson.hpp
+++ b/src/ArduinoJson.hpp
@@ -26,6 +26,15 @@
 #  endif
 #endif
 
+// Remove true and false macros defined by some cores, such as Arduino Due's
+// See issues #2181 and arduino/ArduinoCore-sam#50
+#ifdef true
+#  undef true
+#endif
+#ifdef false
+#  undef false
+#endif
+
 #include "ArduinoJson/Array/JsonArray.hpp"
 #include "ArduinoJson/Object/JsonObject.hpp"
 #include "ArduinoJson/Variant/JsonVariantConst.hpp"