diff --git a/Gems/PhysX/Code/Editor/ColliderComponentMode.cpp b/Gems/PhysX/Code/Editor/ColliderComponentMode.cpp
index 76e687f26a..1f1cdd79fa 100644
--- a/Gems/PhysX/Code/Editor/ColliderComponentMode.cpp
+++ b/Gems/PhysX/Code/Editor/ColliderComponentMode.cpp
@@ -250,6 +250,7 @@ namespace PhysX
             &AzToolsFramework::ViewportUi::ViewportUiRequestBus::Events::CreateCluster, AzToolsFramework::ViewportUi::Alignment::TopLeft);
 
         // create and register the buttons
+        m_buttonIds.resize(static_cast<size_t>(SubMode::NumModes));
         m_buttonIds[static_cast<size_t>(SubMode::Offset)] = RegisterClusterButton(m_modeSelectionClusterId, "Move");
         m_buttonIds[static_cast<size_t>(SubMode::Rotation)] = RegisterClusterButton(m_modeSelectionClusterId, "Rotate");
         m_buttonIds[static_cast<size_t>(SubMode::Dimensions)] = RegisterClusterButton(m_modeSelectionClusterId, "Scale");
diff --git a/Gems/PhysX/Code/Editor/ColliderComponentMode.h b/Gems/PhysX/Code/Editor/ColliderComponentMode.h
index 4c968bb87d..a756075513 100644
--- a/Gems/PhysX/Code/Editor/ColliderComponentMode.h
+++ b/Gems/PhysX/Code/Editor/ColliderComponentMode.h
@@ -66,8 +66,7 @@ namespace PhysX
         AzToolsFramework::ViewportUi::ClusterId
             m_modeSelectionClusterId; //!< Viewport UI cluster for changing sub mode.
 
-        //! Ids for the Viewport UI buttons for each mode.
-        AZStd::fixed_vector< AzToolsFramework::ViewportUi::ButtonId, static_cast<size_t>(SubMode::NumModes)> m_buttonIds;
+        AZStd::vector<AzToolsFramework::ViewportUi::ButtonId> m_buttonIds; //!< Ids for the Viewport UI buttons for each mode.
 
         AZ::Event<AzToolsFramework::ViewportUi::ButtonId>::Handler
             m_modeSelectionHandler; //!< Event handler for sub mode changes.