diff --git a/src/fs/filesystem.ts b/src/fs/filesystem.ts
index e1b524a..280eed5 100644
--- a/src/fs/filesystem.ts
+++ b/src/fs/filesystem.ts
@@ -14,7 +14,6 @@ export const getParentDir = (path: string) => {
   let d = path.split('/').slice(0, -1).join('/');
   return d === '' ? (path.startsWith('/') ? '/' : '.') : d;
 } 
-export const getFileName = (path: string) => path.split('/').splice(-1)[0];
 
 export function readDirAsArray(fs: FS, path: string): Promise<string[] | undefined> {
   return new Promise((res, rej) => fs.readdir(path, (err, files) => err ? rej(err) : res(files)));
diff --git a/src/runner/actions.ts b/src/runner/actions.ts
index 18de1e7..c9b8f3d 100644
--- a/src/runner/actions.ts
+++ b/src/runner/actions.ts
@@ -1,7 +1,7 @@
 // Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
 
 import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
-import { getFileName, getParentDir } from '../fs/filesystem';
+import { getParentDir } from '../fs/filesystem';
 import { spawnOpenSCAD } from "./openscad-runner";
 import { processMergedOutputs } from "./output-parser";
 import { AbortablePromise, turnIntoDelayableExecution } from '../utils';
@@ -14,7 +14,6 @@ export const checkSyntax =
     // const timestamp = Date.now(); 
     
     source = '$preview=true;\n' + source;
-    sourcePath = getFileName(sourcePath);
 
     const job = spawnOpenSCAD({
       inputs: [[sourcePath, source + '\n']],
@@ -58,7 +57,6 @@ export const render =
       prefixLines.push('$preview=true;');
     }
     source = [...prefixLines, source].join('\n');
-    sourcePath = getFileName(sourcePath);
 
     const args = [
       sourcePath,
diff --git a/src/runner/output-parser.ts b/src/runner/output-parser.ts
index 494e91d..6fc273c 100644
--- a/src/runner/output-parser.ts
+++ b/src/runner/output-parser.ts
@@ -1,5 +1,4 @@
 import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
-import { getFileName } from '../fs/filesystem';
 import { MergedOutputs } from "./openscad-worker";
 
 const ignoredLogs = new Set([
@@ -45,10 +44,10 @@ export function parseMergedOutputs(mergedOutputs: MergedOutputs, opts: MergedOut
       severity: monaco.MarkerSeverity.Error
     })
   }
-  const shiftSourceName = opts.shiftSourceLines && getFileName(opts.shiftSourceLines.sourcePath);
+  const shiftSourceName = opts.shiftSourceLines && opts.shiftSourceLines.sourcePath;
   const getLine = (path: string, lineStr: string) => {
     const line = Number(lineStr);
-    if (shiftSourceName && getFileName(path) == shiftSourceName) {
+    if (shiftSourceName && (path == shiftSourceName)) {
       return line - opts.shiftSourceLines!.skipLines;
     } else {
       return line;