diff --git a/Gems/PhysX/Code/Source/Material.cpp b/Gems/PhysX/Code/Source/Material.cpp
index be9e6385a1..813f86de0b 100644
--- a/Gems/PhysX/Code/Source/Material.cpp
+++ b/Gems/PhysX/Code/Source/Material.cpp
@@ -420,14 +420,14 @@ namespace PhysX
             if (physicsMaterialNameFromPhysicsAsset.empty() ||
                 physicsMaterialNameFromPhysicsAsset == Physics::DefaultPhysicsMaterialLabel)
             {
-                materialSelection.SetMaterialId(Physics::MaterialId(), slotIndex);
+                materialSelection.SetMaterialId(Physics::MaterialId(), static_cast<int>(slotIndex));
                 continue;
             }
 
             if (auto it = FindOrCreateMaterial(physicsMaterialNameFromPhysicsAsset);
                 it != m_materials.end())
             {
-                materialSelection.SetMaterialId(Physics::MaterialId::FromUUID(it->first), slotIndex);
+                materialSelection.SetMaterialId(Physics::MaterialId::FromUUID(it->first), static_cast<int>(slotIndex));
             }
             else
             {
@@ -435,7 +435,7 @@ namespace PhysX
                     "UpdateMaterialSelectionFromPhysicsAsset: Physics material '%s' not found in the material library. Mesh material '%s' will use the default physics material.",
                     physicsMaterialNameFromPhysicsAsset.c_str(),
                     meshAsset->m_assetData.m_materialNames[slotIndex].c_str());
-                materialSelection.SetMaterialId(Physics::MaterialId(), slotIndex);
+                materialSelection.SetMaterialId(Physics::MaterialId(), static_cast<int>(slotIndex));
             }
         }
     }
diff --git a/Gems/PhysX/Code/Source/Scene/PhysXScene.cpp b/Gems/PhysX/Code/Source/Scene/PhysXScene.cpp
index b57f8c0fef..b6486995c0 100644
--- a/Gems/PhysX/Code/Source/Scene/PhysXScene.cpp
+++ b/Gems/PhysX/Code/Source/Scene/PhysXScene.cpp
@@ -680,7 +680,7 @@ namespace PhysX
             if (m_freeSceneSlots.empty())
             {
                 m_simulatedBodies.emplace_back(newBodyCrc, newBody);
-                index = m_simulatedBodies.size() - 1;
+                index = static_cast<AzPhysics::SimulatedBodyIndex>(m_simulatedBodies.size() - 1);
             }
             else
             {