diff --git a/src/test/fuzz/fuzz.h b/src/test/fuzz/fuzz.h
index 544379c0b04..73edd8220e0 100644
--- a/src/test/fuzz/fuzz.h
+++ b/src/test/fuzz/fuzz.h
@@ -15,7 +15,7 @@ using TypeInitialize = std::function<void()>;
 
 void FuzzFrameworkRegisterTarget(std::string_view name, TypeTestOneInput target, TypeInitialize init);
 
-void FuzzFrameworkEmptyFun() {}
+inline void FuzzFrameworkEmptyFun() {}
 
 #define FUZZ_TARGET(name) \
     FUZZ_TARGET_INIT(name, FuzzFrameworkEmptyFun)
diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
index cf666a8b93d..509864568d6 100644
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -249,7 +249,7 @@ template <class T>
     return result;
 }
 
-CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
+inline CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
 {
     const Network network = fuzzed_data_provider.PickValueInArray({Network::NET_IPV4, Network::NET_IPV6, Network::NET_INTERNAL, Network::NET_ONION});
     CNetAddr net_addr;
@@ -271,22 +271,22 @@ CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
     return net_addr;
 }
 
-CSubNet ConsumeSubNet(FuzzedDataProvider& fuzzed_data_provider) noexcept
+inline CSubNet ConsumeSubNet(FuzzedDataProvider& fuzzed_data_provider) noexcept
 {
     return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<uint8_t>()};
 }
 
-CService ConsumeService(FuzzedDataProvider& fuzzed_data_provider) noexcept
+inline CService ConsumeService(FuzzedDataProvider& fuzzed_data_provider) noexcept
 {
     return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<uint16_t>()};
 }
 
-CAddress ConsumeAddress(FuzzedDataProvider& fuzzed_data_provider) noexcept
+inline CAddress ConsumeAddress(FuzzedDataProvider& fuzzed_data_provider) noexcept
 {
     return {ConsumeService(fuzzed_data_provider), static_cast<ServiceFlags>(fuzzed_data_provider.ConsumeIntegral<uint64_t>()), fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
 }
 
-CNode ConsumeNode(FuzzedDataProvider& fuzzed_data_provider) noexcept
+inline CNode ConsumeNode(FuzzedDataProvider& fuzzed_data_provider) noexcept
 {
     const NodeId node_id = fuzzed_data_provider.ConsumeIntegral<NodeId>();
     const ServiceFlags local_services = static_cast<ServiceFlags>(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
@@ -302,7 +302,7 @@ CNode ConsumeNode(FuzzedDataProvider& fuzzed_data_provider) noexcept
     return {node_id, local_services, my_starting_height, socket, address, keyed_net_group, local_host_nonce, addr_bind, addr_name, conn_type, inbound_onion};
 }
 
-void InitializeFuzzingContext(const std::string& chain_name = CBaseChainParams::REGTEST)
+inline void InitializeFuzzingContext(const std::string& chain_name = CBaseChainParams::REGTEST)
 {
     static const BasicTestingSetup basic_testing_setup{chain_name, {"-nodebuglogfile"}};
 }