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
@@ -22,7 +22,7 @@
 #include <unistd.h>
 #include <vector>
 
-void test_one_input(std::vector<uint8_t> buffer) {
+void test_one_input(const std::vector<uint8_t> &buffer) {
     CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
     try {
         int nVersion;
diff --git a/src/test/fuzz/fuzz.h b/src/test/fuzz/fuzz.h
--- a/src/test/fuzz/fuzz.h
+++ b/src/test/fuzz/fuzz.h
@@ -8,6 +8,6 @@
 #include <cstdint>
 #include <vector>
 
-void test_one_input(std::vector<uint8_t> buffer);
+void test_one_input(const std::vector<uint8_t> &buffer);
 
 #endif // BITCOIN_TEST_FUZZ_FUZZ_H
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
@@ -28,7 +28,8 @@
 
 // This function is used by libFuzzer
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-    test_one_input(std::vector<uint8_t>(data, data + size));
+    const std::vector<uint8_t> input(data, data + size);
+    test_one_input(input);
     return 0;
 }
 
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
@@ -11,7 +11,7 @@
 /** Flags that are not forbidden by an assert */
 static bool IsValidFlagCombination(uint32_t flags);
 
-void test_one_input(std::vector<uint8_t> buffer) {
+void test_one_input(const std::vector<uint8_t> &buffer) {
     CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
     try {
         int nVersion;