diff --git a/clients/tabby-agent/src/codeCompletion/contexts.ts b/clients/tabby-agent/src/codeCompletion/contexts.ts
index 751d9b04f554..c9ff37a3ea6a 100644
--- a/clients/tabby-agent/src/codeCompletion/contexts.ts
+++ b/clients/tabby-agent/src/codeCompletion/contexts.ts
@@ -141,6 +141,10 @@ export class CompletionContext {
     const prefix = this.prefixLines.slice(Math.max(this.prefixLines.length - config.maxPrefixLines, 0)).join("");
     const suffix = this.suffixLines.slice(0, config.maxSuffixLines).join("");
 
+    // determine system separator
+    const isWindows = process.platform === "win32";
+    const separator = isWindows ? "\\" : "/";
+
     // filepath && git_url
     let relativeFilepathRoot: string | undefined = undefined;
     let filepath: string | undefined = undefined;
@@ -161,14 +165,16 @@ export class CompletionContext {
       relativeFilepathRoot = this.workspace;
     }
     if (relativeFilepathRoot) {
-      filepath = path.relative(relativeFilepathRoot, this.filepath);
+      filepath = path.normalize(path.relative(relativeFilepathRoot, this.filepath)).replace(/[/\\]/g, separator);
     }
 
     // declarations
     const declarations = this.declarations?.map((declaration) => {
       let declarationFilepath = declaration.filepath;
       if (relativeFilepathRoot && declarationFilepath.startsWith(relativeFilepathRoot)) {
-        declarationFilepath = path.relative(relativeFilepathRoot, declarationFilepath);
+        declarationFilepath = path
+          .normalize(path.relative(relativeFilepathRoot, declarationFilepath))
+          .replace(/[/\\]/g, separator);
       }
       return {
         filepath: declarationFilepath,
@@ -195,7 +201,9 @@ export class CompletionContext {
       .map((snippet) => {
         let snippetFilepath = snippet.filepath;
         if (relativeFilepathRoot && snippetFilepath.startsWith(relativeFilepathRoot)) {
-          snippetFilepath = path.relative(relativeFilepathRoot, snippetFilepath);
+          snippetFilepath = path
+            .normalize(path.relative(relativeFilepathRoot, snippetFilepath))
+            .replace(/[/\\]/g, separator);
         }
         return {
           filepath: snippetFilepath,
@@ -209,7 +217,7 @@ export class CompletionContext {
     const snippetsOpenedFiles = this.snippetsFromOpenedFiles
       ?.map((snippet) => {
         return {
-          filepath: snippet.filepath,
+          filepath: path.normalize(snippet.filepath).replace(/[/\\]/g, separator),
           body: snippet.text,
           score: snippet.score,
         };