diff --git a/src/blocks.ts b/src/blocks.ts
index d2889ef..45a4c03 100644
--- a/src/blocks.ts
+++ b/src/blocks.ts
@@ -1330,7 +1330,7 @@ export const sensing_touchingcolor = new ProtoBlock({
     colorCategory: 'sensing',
 });
 
-const __color2 = new Uint8ClampedArray(3);
+const __color2 = new Uint8ClampedArray(4);
 export const sensing_coloristouchingcolor = new ProtoBlock({
     opcode: 'sensing_coloristouchingcolor',
     inputs: {
diff --git a/src/cast.ts b/src/cast.ts
index 03725a4..1dd19a8 100644
--- a/src/cast.ts
+++ b/src/cast.ts
@@ -74,7 +74,7 @@ export const toListIndex = (value: string | number | boolean | void, length: num
  */
 export const toColor = (
     value: string | number | boolean | void,
-    dst = new Uint8ClampedArray(4),
+    dst: Uint8ClampedArray = new Uint8ClampedArray(4),
 ): Uint8ClampedArray => {
     let color;
     if (typeof value === 'string' && value[0] === '#') {