diff --git a/extensions/ohif-cornerstone-extension/src/ToolbarModule.js b/extensions/ohif-cornerstone-extension/src/ToolbarModule.js
index fd5d97b4a..405e767e8 100644
--- a/extensions/ohif-cornerstone-extension/src/ToolbarModule.js
+++ b/extensions/ohif-cornerstone-extension/src/ToolbarModule.js
@@ -90,5 +90,6 @@ const definitions = [
 ];
 
 export default {
-  definitions
+  definitions,
+  defaultContext: 'ACTIVE_VIEWPORT::CORNERSTONE'
 };
diff --git a/extensions/ohif-vtk-extension/src/toolbarModule.js b/extensions/ohif-vtk-extension/src/toolbarModule.js
index 5bf6bdece..3cfa22fbb 100644
--- a/extensions/ohif-vtk-extension/src/toolbarModule.js
+++ b/extensions/ohif-vtk-extension/src/toolbarModule.js
@@ -37,5 +37,6 @@ const definitions = [
 ];
 
 export default {
-  definitions
+  definitions,
+  defaultContext: 'ACTIVE_VIEWPORT::VTK'
 };