diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6b71ade..6020dcdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,4 +16,5 @@ HEAD
 * Always store `serialized("string")` by copy (#1915)
 * Remove the zero-copy mode of `deserializeJson()` and `deserializeMsgPack()`
 * Fix double lookup in `to<JsonVariant>()`
-* Fix double call to `size()` in `serializeMsgPack()`
\ No newline at end of file
+* Fix double call to `size()` in `serializeMsgPack()`
+* Include `ARDUINOJSON_SLOT_OFFSET_SIZE` in the namespace name
diff --git a/src/ArduinoJson/Namespace.hpp b/src/ArduinoJson/Namespace.hpp
index 4ff672c7..e20390b9 100644
--- a/src/ArduinoJson/Namespace.hpp
+++ b/src/ArduinoJson/Namespace.hpp
@@ -11,14 +11,15 @@
 #ifndef ARDUINOJSON_VERSION_NAMESPACE
 
 #  define ARDUINOJSON_VERSION_NAMESPACE                                    \
-    ARDUINOJSON_CONCAT3(ARDUINOJSON_VERSION_MACRO,                         \
+    ARDUINOJSON_CONCAT4(ARDUINOJSON_VERSION_MACRO,                         \
                         ARDUINOJSON_BIN2ALPHA(ARDUINOJSON_ENABLE_PROGMEM,  \
                                               ARDUINOJSON_USE_LONG_LONG,   \
                                               ARDUINOJSON_USE_DOUBLE, 1),  \
                         ARDUINOJSON_BIN2ALPHA(ARDUINOJSON_ENABLE_NAN,      \
                                               ARDUINOJSON_ENABLE_INFINITY, \
                                               ARDUINOJSON_ENABLE_COMMENTS, \
-                                              ARDUINOJSON_DECODE_UNICODE))
+                                              ARDUINOJSON_DECODE_UNICODE), \
+                        ARDUINOJSON_SLOT_OFFSET_SIZE)
 
 #endif
 
diff --git a/src/ArduinoJson/Polyfills/preprocessor.hpp b/src/ArduinoJson/Polyfills/preprocessor.hpp
index 78174143..6998f697 100644
--- a/src/ArduinoJson/Polyfills/preprocessor.hpp
+++ b/src/ArduinoJson/Polyfills/preprocessor.hpp
@@ -6,8 +6,8 @@
 
 #define ARDUINOJSON_CONCAT_(A, B) A##B
 #define ARDUINOJSON_CONCAT2(A, B) ARDUINOJSON_CONCAT_(A, B)
-#define ARDUINOJSON_CONCAT3(A, B, C) \
-  ARDUINOJSON_CONCAT2(ARDUINOJSON_CONCAT2(A, B), C)
+#define ARDUINOJSON_CONCAT4(A, B, C, D) \
+  ARDUINOJSON_CONCAT2(ARDUINOJSON_CONCAT2(A, B), ARDUINOJSON_CONCAT2(C, D))
 
 #define ARDUINOJSON_BIN2ALPHA_0000() A
 #define ARDUINOJSON_BIN2ALPHA_0001() B