diff --git a/lib/std/Io/net/HostName.zig b/lib/std/Io/net/HostName.zig
index 2fc2c4c79a55d9526825db860c9083742b7c6ae9..81f239948a6426404be3329660e68647bd75060c 100644
--- a/lib/std/Io/net/HostName.zig
+++ b/lib/std/Io/net/HostName.zig
@@ -484,6 +484,7 @@ pub const ResolvConf = struct {
                 },
                 .domain, .search => {
                     const rest = line_it.rest();
+                    if (rest.len > rc.search_buffer.len) continue;
                     @memcpy(rc.search_buffer[0..rest.len], rest);
                     rc.search_len = rest.len;
                 },