diff --git a/scripts/lib/node_cache.py b/scripts/lib/node_cache.py
index 7381f85949..f96a08e346 100644
--- a/scripts/lib/node_cache.py
+++ b/scripts/lib/node_cache.py
@@ -46,9 +46,9 @@ def generate_sha1sum_node_modules(setup_dir=None, production=DEFAULT_PRODUCTION)
     sha1sum.update(''.join(sorted(yarn_args)).encode('utf8'))
     return sha1sum.hexdigest()
 
-def setup_node_modules(production=DEFAULT_PRODUCTION, stdout=None, stderr=None, copy_modules=False,
+def setup_node_modules(production=DEFAULT_PRODUCTION, stdout=None, stderr=None,
                        prefer_offline=False):
-    # type: (bool, Optional[IO[Any]], Optional[IO[Any]], bool, bool) -> None
+    # type: (bool, Optional[IO[Any]], Optional[IO[Any]], bool) -> None
     yarn_args = get_yarn_args(production=production)
     if prefer_offline:
         yarn_args.append("--prefer-offline")
@@ -62,8 +62,7 @@ def setup_node_modules(production=DEFAULT_PRODUCTION, stdout=None, stderr=None,
                         yarn_args,
                         success_stamp,
                         stdout=stdout,
-                        stderr=stderr,
-                        copy_modules=copy_modules)
+                        stderr=stderr)
 
     print("Using cached node modules from %s" % (cached_node_modules,))
     cmds = [
@@ -73,28 +72,23 @@ def setup_node_modules(production=DEFAULT_PRODUCTION, stdout=None, stderr=None,
     for cmd in cmds:
         run(cmd, stdout=stdout, stderr=stderr)
 
-def do_yarn_install(target_path, yarn_args, success_stamp, stdout=None, stderr=None,
-                    copy_modules=False):
-    # type: (str, List[str], str, Optional[IO[Any]], Optional[IO[Any]], bool) -> None
+def do_yarn_install(target_path, yarn_args, success_stamp, stdout=None, stderr=None):
+    # type: (str, List[str], str, Optional[IO[Any]], Optional[IO[Any]]) -> None
     cmds = [
         ['mkdir', '-p', target_path],
         ['cp', 'package.json', "yarn.lock", target_path],
     ]
     cached_node_modules = os.path.join(target_path, 'node_modules')
-    if copy_modules:
-        print("Cached version not found! Copying node modules.")
-        cmds.append(["cp", "-rT", "prod-static/serve/node_modules", cached_node_modules])
-    else:
-        print("Cached version not found! Installing node modules.")
+    print("Cached version not found! Installing node modules.")
 
-        # Copy the existing node_modules to speed up install
-        if os.path.exists("node_modules"):
-            cmds.append(["cp", "-R", "node_modules/", cached_node_modules])
-        cd_exec = os.path.join(ZULIP_PATH, "scripts/lib/cd_exec")
-        if os.environ.get('CUSTOM_CA_CERTIFICATES'):
-            cmds.append([YARN_BIN, "config", "set", "cafile", os.environ['CUSTOM_CA_CERTIFICATES']])
-        cmds.append([cd_exec, target_path, YARN_BIN, "install", "--non-interactive", "--frozen-lockfile"] +
-                    yarn_args)
+    # Copy the existing node_modules to speed up install
+    if os.path.exists("node_modules"):
+        cmds.append(["cp", "-R", "node_modules/", cached_node_modules])
+    cd_exec = os.path.join(ZULIP_PATH, "scripts/lib/cd_exec")
+    if os.environ.get('CUSTOM_CA_CERTIFICATES'):
+        cmds.append([YARN_BIN, "config", "set", "cafile", os.environ['CUSTOM_CA_CERTIFICATES']])
+    cmds.append([cd_exec, target_path, YARN_BIN, "install", "--non-interactive", "--frozen-lockfile"] +
+                yarn_args)
     cmds.append(['touch', success_stamp])
 
     for cmd in cmds: