diff --git a/include/reactphysics3d/configuration.h b/include/reactphysics3d/configuration.h
index 8e4569fd..64cba73e 100644
--- a/include/reactphysics3d/configuration.h
+++ b/include/reactphysics3d/configuration.h
@@ -35,6 +35,7 @@
 #include <string>
 #include <cmath>
 #include <reactphysics3d/decimal.h>
+#include <reactphysics3d/containers/Pair.h>
 
 // OS
 #if defined(_WIN32) || defined(_WIN64)
@@ -90,9 +91,6 @@ using uint64 = std::uint64_t;
 
 struct Entity;
 
-// Forward declaration
-template<typename T1, typename T2> class Pair;
-
 using bodypair = Pair<Entity, Entity>;
 
 // ------------------- Enumerations ------------------- //