diff --git a/tools/ts2json.mjs b/tools/ts2json.mjs
index 4013acd..7a1c3e6 100644
--- a/tools/ts2json.mjs
+++ b/tools/ts2json.mjs
@@ -225,7 +225,8 @@ export default function(filename, options = {}) {
     let program = ts.createProgram([filename], options)
     let checker = program.getTypeChecker()
     const sourceFiles = program.getSourceFiles()
-    let sourceFile = sourceFiles.find(file => file.fileName === filename)
+    const filenameUnix = filename.replaceAll('\\', '/')
+    let sourceFile = sourceFiles.find(file => file.fileName === filenameUnix)
 
     ts.forEachChild(sourceFile, visit(node, checker))