diff --git a/extensions/ohif-cornerstone-extension/src/commandsModule.js b/extensions/ohif-cornerstone-extension/src/commandsModule.js
index fea50697f..c7640d7d4 100644
--- a/extensions/ohif-cornerstone-extension/src/commandsModule.js
+++ b/extensions/ohif-cornerstone-extension/src/commandsModule.js
@@ -182,5 +182,6 @@ function _getActiveViewportEnabledElement(viewports, activeIndex) {
 
 export default {
   actions,
-  definitions
+  definitions,
+  defaultContext: 'ACTIVE_VIEWPORT::CORNERSTONE'
 };
diff --git a/extensions/ohif-vtk-extension/src/commandsModule.js b/extensions/ohif-vtk-extension/src/commandsModule.js
index 1647bac41..025443c4a 100644
--- a/extensions/ohif-vtk-extension/src/commandsModule.js
+++ b/extensions/ohif-vtk-extension/src/commandsModule.js
@@ -263,8 +263,12 @@ const definitions = {
   mpr2d: {
     commandFn: actions.mpr2d,
     storeContexts: ['viewports'],
-    options: {}
+    options: {},
+    context: 'VIEWER'
   }
 };
 
-export { definitions };
+export default {
+  definitions,
+  defaultContext: 'ACTIVE_VIEWPORT::VTK'
+};