diff --git a/packages/opencode/src/tool/registry.ts b/packages/opencode/src/tool/registry.ts
index ef0e78ffa..cf3c2cad8 100644
--- a/packages/opencode/src/tool/registry.ts
+++ b/packages/opencode/src/tool/registry.ts
@@ -28,6 +28,7 @@ import { Truncate } from "./truncation"
 import { PlanExitTool, PlanEnterTool } from "./plan"
 import { ApplyPatchTool } from "./apply_patch"
 import { Glob } from "../util/glob"
+import { pathToFileURL } from "url"
 
 export namespace ToolRegistry {
   const log = Log.create({ service: "tool.registry" })
@@ -43,7 +44,7 @@ export namespace ToolRegistry {
     if (matches.length) await Config.waitForDependencies()
     for (const match of matches) {
       const namespace = path.basename(match, path.extname(match))
-      const mod = await import(match)
+      const mod = await import(pathToFileURL(match).href)
       for (const [id, def] of Object.entries<ToolDefinition>(mod)) {
         custom.push(fromPlugin(id === "default" ? namespace : `${namespace}_${id}`, def))
       }