diff --git a/build/fbcode_builder/getdeps.py b/build/fbcode_builder/getdeps.py
index 5efd2ef..968d3a4 100755
--- a/build/fbcode_builder/getdeps.py
+++ b/build/fbcode_builder/getdeps.py
@@ -440,7 +440,13 @@ def run_project_cmd(self, args, loader, manifest):
         elif manager == "deb":
             packages = sorted(set(all_packages["deb"]))
             if packages:
-                cmd_args = ["sudo", "apt", "install", "-y"] + packages
+                cmd_args = [
+                    "sudo",
+                    "--preserve-env=http_proxy",
+                    "apt-get",
+                    "install",
+                    "-y",
+                ] + packages
         elif manager == "homebrew":
             packages = sorted(set(all_packages["homebrew"]))
             if packages:
@@ -1155,7 +1161,7 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
                 build_opts.allow_system_packages
                 and build_opts.host_type.get_package_manager()
             ):
-                sudo_arg = "sudo "
+                sudo_arg = "sudo --preserve-env=http_proxy "
                 allow_sys_arg = " --allow-system-packages"
                 if build_opts.host_type.get_package_manager() == "deb":
                     out.write("    - name: Update system package info\n")