diff --git a/src/test/overlay/compression_test.cpp b/src/test/overlay/compression_test.cpp
index 60cc69a14f2..3ce5ac9a41c 100644
--- a/src/test/overlay/compression_test.cpp
+++ b/src/test/overlay/compression_test.cpp
@@ -395,6 +395,37 @@ class compression_test : public beast::unit_test::Suite
             "TMValidatorListCollection");
     }
 
+    void
+    testMtSquelchUncompressed()
+    {
+        testcase("mtSQUELCH is uncompressed");
+
+        //construct >70 so should be eligible for compression
+        auto squelch = std::make_shared<protocol::TMSquelch>();
+        squelch->set_squelch(true);
+        // Use a large validatorPubKey to push the message over the 70-byte
+        // threshold that triggers compression
+        std::string largePubKey(256, 'A');
+        squelch->set_validatorpubkey(largePubKey);
+        squelch->set_squelchduration(600);
+
+        Message m(*squelch, protocol::mtSQUELCH);
+
+        auto const& compressed = m.getBuffer(Compressed::On);
+        auto const& uncompressed = m.getBuffer(Compressed::Off);
+
+        BEAST_EXPECT(compressed.size() == uncompressed.size());
+        BEAST_EXPECT(compressed == uncompressed);
+
+        log << "  Uncompressed size: " << uncompressed.size() << " bytes\n";
+        log << "  'Compressed' size: " << compressed.size() << " bytes\n";
+        log << "  Buffers are identical: "
+            << (compressed == uncompressed
+                    ? "YES (mtSQUELCH is non-compressible)"
+                    : "NO — REGRESSION")
+            << std::endl;
+    }
+
     void
     testHandshake()
     {
@@ -455,6 +486,7 @@ class compression_test : public beast::unit_test::Suite
     {
         testProtocol();
         testHandshake();
+        testMtSquelchUncompressed();
     }
 };
 
diff --git a/src/xrpld/overlay/detail/Message.cpp b/src/xrpld/overlay/detail/Message.cpp
index c6e05115152..fff08bb934d 100644
--- a/src/xrpld/overlay/detail/Message.cpp
+++ b/src/xrpld/overlay/detail/Message.cpp
@@ -73,7 +73,6 @@ Message::compress()
         if (messageBytes <= 70)
             return false;
 
-        // NOLINTNEXTLINE(bugprone-switch-missing-default-case)
         switch (type)
         {
             case protocol::mtMANIFESTS:
@@ -97,6 +96,11 @@ Message::compress()
             case protocol::mtPROOF_PATH_RESPONSE:
             case protocol::mtREPLAY_DELTA_REQ:
             case protocol::mtHAVE_TRANSACTIONS:
+            case protocol::mtSQUELCH:
+                break;
+            default:
+                XRPL_ASSERT(
+                    false, "xrpl::Message::compress : unknown message type");
                 break;
         }
         return false;