diff --git a/source/common/network/io_socket_handle_impl.cc b/source/common/network/io_socket_handle_impl.cc
index c40e9f03d77e0..35708c61f508e 100644
--- a/source/common/network/io_socket_handle_impl.cc
+++ b/source/common/network/io_socket_handle_impl.cc
@@ -587,11 +587,19 @@ absl::optional<std::string> IoSocketHandleImpl::interfaceName() {
     return absl::nullopt;
   }
 
+  if (socket_address->ip()->version() != Address::IpVersion::v4 &&
+      socket_address->ip()->version() != Address::IpVersion::v6) {
+    ENVOY_BUG(false, fmt::format("unexpected IP family {}", socket_address->ip()->version()));
+  }
+
   Api::InterfaceAddressVector interface_addresses{};
   const Api::SysCallIntResult rc = os_syscalls_singleton.getifaddrs(interface_addresses);
   RELEASE_ASSERT(!rc.return_value_, fmt::format("getiffaddrs error: {}", rc.errno_));
 
   absl::optional<std::string> selected_interface_name{};
+  absl::uint128 socket_address_value = socket_address->ip()->version() == Address::IpVersion::v4
+                                           ? socket_address->ip()->ipv4()->address()
+                                           : socket_address->ip()->ipv6()->address();
   for (const auto& interface_address : interface_addresses) {
     if (!interface_address.interface_addr_) {
       continue;
@@ -600,20 +608,10 @@ absl::optional<std::string> IoSocketHandleImpl::interfaceName() {
     if (socket_address->ip()->version() == interface_address.interface_addr_->ip()->version()) {
       // Compare address _without port_.
       // TODO: create common addressAsStringWithoutPort method to simplify code here.
-      absl::uint128 socket_address_value;
-      absl::uint128 interface_address_value;
-      switch (socket_address->ip()->version()) {
-      case Address::IpVersion::v4:
-        socket_address_value = socket_address->ip()->ipv4()->address();
-        interface_address_value = interface_address.interface_addr_->ip()->ipv4()->address();
-        break;
-      case Address::IpVersion::v6:
-        socket_address_value = socket_address->ip()->ipv6()->address();
-        interface_address_value = interface_address.interface_addr_->ip()->ipv6()->address();
-        break;
-      default:
-        ENVOY_BUG(false, fmt::format("unexpected IP family {}", socket_address->ip()->version()));
-      }
+      absl::uint128 interface_address_value =
+          interface_address.interface_addr_->ip()->version() == Address::IpVersion::v4
+              ? interface_address.interface_addr_->ip()->ipv4()->address()
+              : interface_address.interface_addr_->ip()->ipv6()->address();
 
       if (socket_address_value == interface_address_value) {
         selected_interface_name = interface_address.interface_name_;