diff --git a/iocore/net/SSLCertLookup.cc b/iocore/net/SSLCertLookup.cc
index 508ea2ffe6..f94f515098 100644
--- a/iocore/net/SSLCertLookup.cc
+++ b/iocore/net/SSLCertLookup.cc
@@ -54,12 +54,12 @@ struct SSLAddressLookupKey {
// different matches if there is a certificate on the port.
ts::FixedBufferWriter w{key, sizeof(key)};
- w.print("{}", ts::bwf::Hex_Dump(ip)); // dump raw bytes in hex, don't
format as IP address.
+ w.print("{}", ts::bwf::Hex_Dump(ip)); // dump as raw hex bytes, don't
format as IP address.
if (in_port_t port = ip.host_order_port(); port) {
- sep = unsigned(w.size());
+ sep = static_cast<unsigned char>(w.size());
w.print(".{:x}", port);
}
- w.print("\0");
+ w.write('\0'); // force C-string termination.
}
const char *
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