diff --git a/src/test/fuzz/fuzz.cpp b/src/test/fuzz/fuzz.cpp
index 374166e0fc..3c83691a07 100644
--- a/src/test/fuzz/fuzz.cpp
+++ b/src/test/fuzz/fuzz.cpp
@@ -4,11 +4,16 @@
 
 #include <test/fuzz/fuzz.h>
 
+#include <netaddress.h>
+#include <netbase.h>
 #include <test/util/setup_common.h>
 #include <util/check.h>
+#include <util/sock.h>
 
 #include <cstdint>
 #include <string>
+#include <exception>
+#include <memory>
 #include <unistd.h>
 #include <vector>
 
@@ -30,6 +35,9 @@ static TypeTestOneInput* g_test_one_input{nullptr};
 
 void initialize()
 {
+    // Terminate immediately if a fuzzing harness ever tries to create a TCP socket.
+    CreateSock = [](const CService&) -> std::unique_ptr<Sock> { std::terminate(); };
+
     // Terminate immediately if a fuzzing harness ever tries to perform a DNS lookup.
     g_dns_lookup = [](const std::string& name, bool allow_lookup) {
         if (allow_lookup) {