diff --git a/lib/hkStubs/CMakeLists.txt b/lib/hkStubs/CMakeLists.txt
index 613502a6..2c3d8c4b 100644
--- a/lib/hkStubs/CMakeLists.txt
+++ b/lib/hkStubs/CMakeLists.txt
@@ -107,6 +107,7 @@ add_library(hkStubs OBJECT
   Havok/Physics2012/Dynamics/Common/hkpMaterial.h
   Havok/Physics2012/Dynamics/Common/hkpProperty.h
   Havok/Physics2012/Dynamics/Constraint/hkpConstraintInstance.h
+  Havok/Physics2012/Dynamics/Constraint/hkpConstraintOwner.h
   Havok/Physics2012/Dynamics/Entity/hkpEntity.h
   Havok/Physics2012/Dynamics/Entity/hkpRigidBody.h
   Havok/Physics2012/Dynamics/Entity/hkpRigidBodyCinfo.h
diff --git a/lib/hkStubs/Havok/Common/Base/Math/hkMath.h b/lib/hkStubs/Havok/Common/Base/Math/hkMath.h
index b928b610..18362756 100644
--- a/lib/hkStubs/Havok/Common/Base/Math/hkMath.h
+++ b/lib/hkStubs/Havok/Common/Base/Math/hkMath.h
@@ -14,3 +14,12 @@
 #include <Havok/Common/Base/Math/Vector/hkVector4Comparison.h>
 
 #include <Havok/Common/Base/Math/Vector/hkVector4f.inl>
+
+namespace hkMath {
+
+template <typename T1, typename T2>
+HK_FORCE_INLINE T1 max2(T1 x, T2 y) {
+    return x > static_cast<T1>(y) ? x : static_cast<T1>(y);
+}
+
+}  // namespace hkMath
diff --git a/lib/hkStubs/Havok/Physics/Constraint/Data/hkpConstraintInfo.h b/lib/hkStubs/Havok/Physics/Constraint/Data/hkpConstraintInfo.h
index f5febd76..c7edeeba 100644
--- a/lib/hkStubs/Havok/Physics/Constraint/Data/hkpConstraintInfo.h
+++ b/lib/hkStubs/Havok/Physics/Constraint/Data/hkpConstraintInfo.h
@@ -5,8 +5,32 @@
 struct hkpConstraintInfo {
     HK_DECLARE_CLASS_ALLOCATOR(hkpConstraintInfo)
 
+    inline void add(int schemaSize, int numSolverResults, int numSolverTempElems);
+    inline void add(const hkpConstraintInfo& delta);
+    inline void sub(const hkpConstraintInfo& delta);
+
     int m_maxSizeOfSchema;
     int m_sizeOfSchemas;
     int m_numSolverResults;
     int m_numSolverElemTemps;
 };
+
+inline void hkpConstraintInfo::add(int schemaSize, int numSolverResults, int numSolverTempElems) {
+    m_sizeOfSchemas += schemaSize;
+    m_numSolverResults += numSolverResults;
+    m_numSolverElemTemps += numSolverTempElems;
+}
+
+inline void hkpConstraintInfo::add(const hkpConstraintInfo& delta) {
+    m_maxSizeOfSchema = hkMath::max2(m_maxSizeOfSchema, delta.m_maxSizeOfSchema);
+    m_maxSizeOfSchema = hkMath::max2(m_maxSizeOfSchema, delta.m_sizeOfSchemas);
+    m_sizeOfSchemas += delta.m_sizeOfSchemas;
+    m_numSolverResults += delta.m_numSolverResults;
+    m_numSolverElemTemps += delta.m_numSolverElemTemps;
+}
+
+inline void hkpConstraintInfo::sub(const hkpConstraintInfo& delta) {
+    m_sizeOfSchemas -= delta.m_sizeOfSchemas;
+    m_numSolverResults -= delta.m_numSolverResults;
+    m_numSolverElemTemps -= delta.m_numSolverElemTemps;
+}
diff --git a/lib/hkStubs/Havok/Physics2012/Dynamics/Constraint/hkpConstraintOwner.h b/lib/hkStubs/Havok/Physics2012/Dynamics/Constraint/hkpConstraintOwner.h
new file mode 100644
index 00000000..4ad43e2f
--- /dev/null
+++ b/lib/hkStubs/Havok/Physics2012/Dynamics/Constraint/hkpConstraintOwner.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <Havok/Common/Base/hkBase.h>
+#include <Havok/Physics2012/Dynamics/Constraint/hkpConstraintInstance.h>
+
+class hkpConstraintOwner : public hkReferencedObject {
+public:
+    HK_DECLARE_CLASS_ALLOCATOR(hkpConstraintOwner)
+
+    inline void addConstraintInfo(hkpConstraintInstance* constraint, hkpConstraintInfo& delta);
+    inline void subConstraintInfo(hkpConstraintInstance* constraint, hkpConstraintInfo& delta);
+
+    virtual void addConstraintToCriticalLockedIsland(hkpConstraintInstance* constraint) {}
+    virtual void removeConstraintFromCriticalLockedIsland(hkpConstraintInstance* constraint) {}
+    virtual void addCallbackRequest(hkpConstraintInstance* constraint, int request) {}
+    virtual void checkAccessRw() {}
+
+    hkpConstraintInfo m_constraintInfo;
+};
+
+inline void hkpConstraintOwner::addConstraintInfo(hkpConstraintInstance* constraint,
+                                                  hkpConstraintInfo& delta) {
+    if (!constraint->m_internal)
+        return;
+
+    m_constraintInfo.add(delta);
+    constraint->m_internal->addConstraintInfo(delta);
+    m_constraintInfo.m_maxSizeOfSchema =
+        hkMath::max2(m_constraintInfo.m_maxSizeOfSchema, constraint->m_internal->m_sizeOfSchemas);
+}
+
+inline void hkpConstraintOwner::subConstraintInfo(hkpConstraintInstance* constraint,
+                                                  hkpConstraintInfo& delta) {
+    if (!constraint->m_internal)
+        return;
+
+    m_constraintInfo.sub(delta);
+    constraint->m_internal->subConstraintInfo(delta);
+}