diff --git a/src/lib/functions/registry.js b/src/lib/functions/registry.js
index 6f7408129b7..fac6b180609 100644
--- a/src/lib/functions/registry.js
+++ b/src/lib/functions/registry.js
@@ -176,7 +176,6 @@ class FunctionsRegistry {
 
     const functions = await this.listFunctions(directories, {
       featureFlags: {
-        buildGoSource: true,
         buildRustSource: env.NETLIFY_EXPERIMENTAL_BUILD_RUST_SOURCE === 'true',
       },
       config: this.config,
diff --git a/src/utils/deploy/hash-fns.js b/src/utils/deploy/hash-fns.js
index 7e509968cd2..53638def9a1 100644
--- a/src/utils/deploy/hash-fns.js
+++ b/src/utils/deploy/hash-fns.js
@@ -61,11 +61,7 @@ const getFunctionZips = async ({
     })
   }
 
-  const featureFlags = {
-    zisi_detect_esm: true,
-  }
-
-  return await zipIt.zipFunctions(directories, tmpDir, { basePath: rootDir, config: functionsConfig, featureFlags })
+  return await zipIt.zipFunctions(directories, tmpDir, { basePath: rootDir, config: functionsConfig })
 }
 
 const hashFns = async (