diff --git a/src/components/PatternCanvas.tsx b/src/components/PatternCanvas.tsx
index c9ab905..c7cdbdb 100644
--- a/src/components/PatternCanvas.tsx
+++ b/src/components/PatternCanvas.tsx
@@ -292,11 +292,11 @@ export function PatternCanvas() {
                 }}
               >
                 <Stitches
-                  stitches={pesData.penStitches.stitches.map((s, i) => {
+                  stitches={pesData.penStitches.stitches.map((s, i): [number, number, number, number] => {
                     // Convert PEN stitch format {x, y, flags, isJump} to PES format [x, y, cmd, colorIndex]
                     const cmd = s.isJump ? 0x10 : 0;  // MOVE flag if jump
                     const colorIndex = pesData.penStitches.colorBlocks.find(
-                      b => i >= b.startStitch && i <= b.endStitch
+                      (b) => i >= b.startStitch && i <= b.endStitch
                     )?.colorIndex ?? 0;
                     return [s.x, s.y, cmd, colorIndex];
                   })}
@@ -315,10 +315,10 @@ export function PatternCanvas() {
               <Group x={localPatternOffset.x} y={localPatternOffset.y}>
                 <CurrentPosition
                   currentStitchIndex={sewingProgress.currentStitch}
-                  stitches={pesData.penStitches.stitches.map((s, i) => {
+                  stitches={pesData.penStitches.stitches.map((s, i): [number, number, number, number] => {
                     const cmd = s.isJump ? 0x10 : 0;
                     const colorIndex = pesData.penStitches.colorBlocks.find(
-                      b => i >= b.startStitch && i <= b.endStitch
+                      (b) => i >= b.startStitch && i <= b.endStitch
                     )?.colorIndex ?? 0;
                     return [s.x, s.y, cmd, colorIndex];
                   })}
diff --git a/src/utils/patternConverterClient.ts b/src/utils/patternConverterClient.ts
index 30496c8..2ac46ec 100644
--- a/src/utils/patternConverterClient.ts
+++ b/src/utils/patternConverterClient.ts
@@ -1,6 +1,7 @@
 import type { WorkerMessage, WorkerResponse } from '../workers/patternConverter.worker';
 import PatternConverterWorker from '../workers/patternConverter.worker?worker';
-import { parsePenData, type PenData } from './penParser';
+import { parsePenData } from './penParser';
+import type { PenData } from '../types/machine';
 
 export type PyodideState = 'not_loaded' | 'loading' | 'ready' | 'error';