diff --git a/src/test/fuzz/descriptor_parse.cpp b/src/test/fuzz/descriptor_parse.cpp
--- a/src/test/fuzz/descriptor_parse.cpp
+++ b/src/test/fuzz/descriptor_parse.cpp
@@ -3,10 +3,14 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparams.h>
+#include <pubkey.h>
 #include <script/descriptor.h>
 #include <test/fuzz/fuzz.h>
 
+#include <memory>
+
 void initialize() {
+    static const auto verify_handle = std::make_unique<ECCVerifyHandle>();
     SelectParams(CBaseChainParams::REGTEST);
 }
 
diff --git a/src/test/fuzz/deserialize.cpp b/src/test/fuzz/deserialize.cpp
--- a/src/test/fuzz/deserialize.cpp
+++ b/src/test/fuzz/deserialize.cpp
@@ -12,6 +12,7 @@
 #include <net.h>
 #include <primitives/block.h>
 #include <protocol.h>
+#include <pubkey.h>
 #include <streams.h>
 #include <undo.h>
 #include <version.h>
@@ -22,6 +23,11 @@
 #include <unistd.h>
 #include <vector>
 
+void initialize() {
+    // Fuzzers using pubkey must hold an ECCVerifyHandle.
+    static const auto verify_handle = std::make_unique<ECCVerifyHandle>();
+}
+
 void test_one_input(const std::vector<uint8_t> &buffer) {
     CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
     try {
diff --git a/src/test/fuzz/eval_script.cpp b/src/test/fuzz/eval_script.cpp
--- a/src/test/fuzz/eval_script.cpp
+++ b/src/test/fuzz/eval_script.cpp
@@ -2,11 +2,17 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <pubkey.h>
 #include <script/interpreter.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 
 #include <limits>
+#include <memory>
+
+void initialize() {
+    static const auto verify_handle = std::make_unique<ECCVerifyHandle>();
+}
 
 void test_one_input(const std::vector<uint8_t> &buffer) {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
diff --git a/src/test/fuzz/fuzz.cpp b/src/test/fuzz/fuzz.cpp
--- a/src/test/fuzz/fuzz.cpp
+++ b/src/test/fuzz/fuzz.cpp
@@ -4,10 +4,9 @@
 
 #include <test/fuzz/fuzz.h>
 
-#include <pubkey.h>
-
-#include <memory>
+#include <cstdint>
 #include <unistd.h>
+#include <vector>
 
 static bool read_stdin(std::vector<uint8_t> &data) {
     uint8_t buffer[1024];
@@ -23,9 +22,7 @@
 }
 
 // Default initialization: Override using a non-weak initialize().
-__attribute__((weak)) void initialize() {
-    const static auto verify_handle = std::make_unique<ECCVerifyHandle>();
-}
+__attribute__((weak)) void initialize() {}
 
 // This function is used by libFuzzer
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
@@ -40,13 +37,9 @@
     return 0;
 }
 
-// Disabled under WIN32 due to clash with Cygwin's WinMain.
-#ifndef WIN32
 // Declare main(...) "weak" to allow for libFuzzer linking. libFuzzer provides
 // the main(...) function.
-__attribute__((weak))
-#endif
-int main(int argc, char **argv) {
+__attribute__((weak)) int main(int argc, char **argv) {
     initialize();
 #ifdef __AFL_INIT
     // Enable AFL deferred forkserver mode. Requires compilation using
diff --git a/src/test/fuzz/script_flags.cpp b/src/test/fuzz/script_flags.cpp
--- a/src/test/fuzz/script_flags.cpp
+++ b/src/test/fuzz/script_flags.cpp
@@ -2,15 +2,22 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <pubkey.h>
 #include <script/interpreter.h>
 #include <streams.h>
 #include <version.h>
 
 #include <test/fuzz/fuzz.h>
 
+#include <memory>
+
 /** Flags that are not forbidden by an assert */
 static bool IsValidFlagCombination(uint32_t flags);
 
+void initialize() {
+    static const auto verify_handle = std::make_unique<ECCVerifyHandle>();
+}
+
 void test_one_input(const std::vector<uint8_t> &buffer) {
     CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
     try {