diff --git a/js/common/view/QuestionBar.ts b/js/common/view/QuestionBar.ts
index 833ba211..c62b9067 100644
--- a/js/common/view/QuestionBar.ts
+++ b/js/common/view/QuestionBar.ts
@@ -24,7 +24,7 @@ class QuestionBar extends StatusBar {
 
   constructor( layoutBounds: Bounds2, boundsProperty: Property<Bounds2>, providedOptions: QuestionBarOptions ) {
 
-    const options = optionize<QuestionBarOptions>( {
+    const options = optionize<QuestionBarOptions, {}>( {
       floatToTop: true,
       barHeight: 70
     }, providedOptions );
diff --git a/js/lab/LabScreen.ts b/js/lab/LabScreen.ts
index 2619ab95..e2d80de4 100644
--- a/js/lab/LabScreen.ts
+++ b/js/lab/LabScreen.ts
@@ -22,7 +22,7 @@ class LabScreen extends CASScreen<LabModel, LabScreenView> {
 
   constructor( providedOptions: LabScreenOptions ) {
 
-    const options = optionize<LabScreenOptions>( {
+    const options = optionize<LabScreenOptions, {}>( {
       name: centerAndSpreadStrings.screen.lab,
       backgroundColorProperty: CASColors.screenBackgroundColorProperty,
       tandem: Tandem.REQUIRED
diff --git a/js/mean-and-median/MeanAndMedianScreen.ts b/js/mean-and-median/MeanAndMedianScreen.ts
index 72d7b8ab..4edea684 100644
--- a/js/mean-and-median/MeanAndMedianScreen.ts
+++ b/js/mean-and-median/MeanAndMedianScreen.ts
@@ -22,7 +22,7 @@ class MeanAndMedianScreen extends CASScreen<MeanAndMedianModel, MeanAndMedianScr
 
   constructor( providedOptions: MeanAndMedianScreenOptions ) {
 
-    const options = optionize<MeanAndMedianScreenOptions>( {
+    const options = optionize<MeanAndMedianScreenOptions, {}>( {
       name: centerAndSpreadStrings.screen.meanAndMedian,
       backgroundColorProperty: CASColors.screenBackgroundColorProperty,
       tandem: Tandem.REQUIRED
diff --git a/js/median/MedianScreen.ts b/js/median/MedianScreen.ts
index 585c6e19..8ec7043a 100644
--- a/js/median/MedianScreen.ts
+++ b/js/median/MedianScreen.ts
@@ -22,7 +22,7 @@ class MedianScreen extends CASScreen<MedianModel, MedianScreenView> {
 
   constructor( providedOptions: MedianScreenOptions ) {
 
-    const options = optionize<MedianScreenOptions>( {
+    const options = optionize<MedianScreenOptions, {}>( {
       name: centerAndSpreadStrings.screen.median,
       backgroundColorProperty: CASColors.screenBackgroundColorProperty,
       tandem: Tandem.REQUIRED
diff --git a/js/spread/SpreadScreen.ts b/js/spread/SpreadScreen.ts
index 3a070751..3b229923 100644
--- a/js/spread/SpreadScreen.ts
+++ b/js/spread/SpreadScreen.ts
@@ -22,7 +22,7 @@ class SpreadScreen extends CASScreen<SpreadModel, SpreadScreenView> {
 
   constructor( providedOptions: SpreadScreenOptions ) {
 
-    const options = optionize<SpreadScreenOptions>( {
+    const options = optionize<SpreadScreenOptions, {}>( {
       name: centerAndSpreadStrings.screen.spread,
       backgroundColorProperty: CASColors.screenBackgroundColorProperty,
       tandem: Tandem.REQUIRED