diff --git a/sources/reactphysics3d/constraint/Constraint.cpp b/sources/reactphysics3d/constraint/Constraint.cpp
index d3a7d09a..8bd5dbec 100644
--- a/sources/reactphysics3d/constraint/Constraint.cpp
+++ b/sources/reactphysics3d/constraint/Constraint.cpp
@@ -25,7 +25,7 @@ using namespace reactphysics3d;
 
 // Constructor
 Constraint::Constraint(Body* const body1, Body* const body2)
-           :body1(body1), body2(body2) {
+           :body1(body1), body2(body2), active(true) {
 
 }