diff --git a/src/ArduinoJson/Array/ArrayImpl.hpp b/src/ArduinoJson/Array/ArrayImpl.hpp
index 2b72d586..2000567e 100644
--- a/src/ArduinoJson/Array/ArrayImpl.hpp
+++ b/src/ArduinoJson/Array/ArrayImpl.hpp
@@ -6,6 +6,7 @@
 
 #include <ArduinoJson/Array/ArrayData.hpp>
 #include <ArduinoJson/Variant/VariantCompare.hpp>
+#include <ArduinoJson/Variant/VariantSlot.hpp>
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
@@ -70,4 +71,9 @@ inline bool ArrayData::addValue(T&& value, ResourceManager* resources) {
   return true;
 }
 
+// Returns the size (in bytes) of an array with n elements.
+constexpr size_t sizeofArray(size_t n) {
+  return n * sizeof(VariantSlot);
+}
+
 ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/src/ArduinoJson/Object/ObjectImpl.hpp b/src/ArduinoJson/Object/ObjectImpl.hpp
index b193a929..7830576e 100644
--- a/src/ArduinoJson/Object/ObjectImpl.hpp
+++ b/src/ArduinoJson/Object/ObjectImpl.hpp
@@ -6,6 +6,7 @@
 
 #include <ArduinoJson/Object/ObjectData.hpp>
 #include <ArduinoJson/Variant/VariantCompare.hpp>
+#include <ArduinoJson/Variant/VariantSlot.hpp>
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
@@ -67,4 +68,9 @@ inline VariantData* ObjectData::addMember(TAdaptedString key,
   return valueSlot.data();
 }
 
+// Returns the size (in bytes) of an object with n members.
+constexpr size_t sizeofObject(size_t n) {
+  return 2 * n * sizeof(VariantSlot);
+}
+
 ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/src/ArduinoJson/Variant/VariantSlot.hpp b/src/ArduinoJson/Variant/VariantSlot.hpp
index a600c6af..cdbd8863 100644
--- a/src/ArduinoJson/Variant/VariantSlot.hpp
+++ b/src/ArduinoJson/Variant/VariantSlot.hpp
@@ -24,14 +24,4 @@ union VariantSlot {
   FreeSlot free;
 };
 
-// Returns the size (in bytes) of an array with n elements.
-constexpr size_t sizeofArray(size_t n) {
-  return n * sizeof(VariantSlot);
-}
-
-// Returns the size (in bytes) of an object with n members.
-constexpr size_t sizeofObject(size_t n) {
-  return 2 * n * sizeof(VariantSlot);
-}
-
 ARDUINOJSON_END_PRIVATE_NAMESPACE