diff --git a/js/common/view/RatioHandNode.ts b/js/common/view/RatioHandNode.ts
index 1a2fa8e4..ffaa578b 100644
--- a/js/common/view/RatioHandNode.ts
+++ b/js/common/view/RatioHandNode.ts
@@ -250,7 +250,7 @@ class FilledInHandPath extends Path {
 
   constructor( providedOptions?: PathOptions ) {
 
-    const options = optionize<PathOptions>( {
+    const options = optionize<PathOptions,{}>( {
       stroke: 'black',
       lineWidth: 2
     }, providedOptions );
@@ -273,7 +273,7 @@ class CutOutHandPath extends Path {
 
   constructor( providedOptions?: PathOptions ) {
 
-    const options = optionize<PathOptions>( {
+    const options = optionize<PathOptions,{}>( {
       stroke: 'black',
       lineWidth: 2
     }, providedOptions );
diff --git a/js/common/view/TickMarkViewRadioButtonGroup.ts b/js/common/view/TickMarkViewRadioButtonGroup.ts
index a27cbce2..edfab35f 100644
--- a/js/common/view/TickMarkViewRadioButtonGroup.ts
+++ b/js/common/view/TickMarkViewRadioButtonGroup.ts
@@ -97,7 +97,7 @@ class NumberedTickMarksIconPath extends Path {
 
   constructor( providedOptions?: PathOptions ) {
 
-    const options = optionize<PathOptions>( {
+    const options = optionize<PathOptions, {}>( {
       fill: 'black',
       scale: ICON_SCALE
     }, providedOptions );
@@ -128,7 +128,7 @@ class TickMarksIconPath extends Path {
 
   constructor( providedOptions?: PathOptions ) {
 
-    const options = optionize<PathOptions>( {
+    const options = optionize<PathOptions, {}>( {
       fill: 'black',
       scale: ICON_SCALE
     }, providedOptions );