diff --git a/packages/opencode/src/installation/index.ts b/packages/opencode/src/installation/index.ts
index 323810e3..f4209e5b 100644
--- a/packages/opencode/src/installation/index.ts
+++ b/packages/opencode/src/installation/index.ts
@@ -132,6 +132,7 @@ export namespace Installation {
         const formula = await getBrewFormula()
         cmd = $`brew install ${formula}`.env({
           HOMEBREW_NO_AUTO_UPDATE: "1",
+          ...process.env,
         })
         break
       }