diff --git a/src/init.cpp b/src/init.cpp
index 952587dcf3..beb5f408fd 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -383,12 +383,12 @@ void SetupServerArgs()
         "-allowselfsignedrootcertificates", "-choosedatadir", "-lang=<lang>", "-min", "-resetguisettings", "-rootcertificates=<file>", "-splash", "-uiplatform"};
 
     gArgs.AddArg("-version", "Print version and exit", false, OptionsCategory::OPTIONS);
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     gArgs.AddArg("-alertnotify=<cmd>", "Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)", false, OptionsCategory::OPTIONS);
 #endif
     gArgs.AddArg("-assumevalid=<hex>", strprintf("If this block is in the chain assume that it and its ancestors are valid and potentially skip their script verification (0 to verify all, default: %s, testnet: %s)", defaultChainParams->GetConsensus().defaultAssumeValid.GetHex(), testnetChainParams->GetConsensus().defaultAssumeValid.GetHex()), false, OptionsCategory::OPTIONS);
     gArgs.AddArg("-blocksdir=<dir>", "Specify directory to hold blocks subdirectory for *.dat files (default: <datadir>)", false, OptionsCategory::OPTIONS);
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     gArgs.AddArg("-blocknotify=<cmd>", "Execute command when the best block changes (%s in cmd is replaced by block hash)", false, OptionsCategory::OPTIONS);
 #endif
     gArgs.AddArg("-blockreconstructionextratxn=<n>", strprintf("Extra transactions to keep in memory for compact block reconstructions (default: %u)", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN), false, OptionsCategory::OPTIONS);
@@ -632,7 +632,7 @@ std::string LicenseInfo()
            "\n";
 }
 
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
 static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex)
 {
     if (initialSync || !pBlockIndex)
@@ -1771,7 +1771,7 @@ bool AppInitMain(InitInterfaces& interfaces)
         fHaveGenesis = true;
     }
 
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     if (gArgs.IsArgSet("-blocknotify"))
         uiInterface.NotifyBlockTip_connect(BlockNotifyCallback);
 #endif
diff --git a/src/util/system.cpp b/src/util/system.cpp
index 3bace489a8..a7c70ebd23 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1158,7 +1158,7 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 }
 #endif
 
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
 void runCommand(const std::string& strCommand)
 {
     if (strCommand.empty()) return;
diff --git a/src/util/system.h b/src/util/system.h
index 2a32362d36..a5113984ad 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -89,7 +89,7 @@ fs::path GetConfigFile(const std::string& confPath);
 #ifdef WIN32
 fs::path GetSpecialFolderPath(int nFolder, bool fCreate = true);
 #endif
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
 void runCommand(const std::string& strCommand);
 #endif
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 73b8d46777..6c603f63b7 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1111,7 +1111,7 @@ static CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
 static void AlertNotify(const std::string& strMessage)
 {
     uiInterface.NotifyAlertChanged();
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     std::string strCmd = gArgs.GetArg("-alertnotify", "");
     if (strCmd.empty()) return;
 
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 0085c3bac9..4c327c77ae 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -57,7 +57,7 @@ void WalletInit::AddWalletOptions() const
     gArgs.AddArg("-wallet=<path>", "Specify wallet database path. Can be specified multiple times to load multiple wallets. Path is interpreted relative to <walletdir> if it is not absolute, and will be created if it does not exist (as a directory containing a wallet.dat file and log files). For backwards compatibility this will also accept names of existing data files in <walletdir>.)", false, OptionsCategory::WALLET);
     gArgs.AddArg("-walletbroadcast",  strprintf("Make the wallet broadcast transactions (default: %u)", DEFAULT_WALLETBROADCAST), false, OptionsCategory::WALLET);
     gArgs.AddArg("-walletdir=<dir>", "Specify directory to hold wallets (default: <datadir>/wallets if it exists, otherwise <datadir>)", false, OptionsCategory::WALLET);
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     gArgs.AddArg("-walletnotify=<cmd>", "Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)", false, OptionsCategory::WALLET);
 #endif
     gArgs.AddArg("-walletrbf", strprintf("Send transactions with full-RBF opt-in enabled (RPC only, default: %u)", DEFAULT_WALLET_RBF), false, OptionsCategory::WALLET);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index e70704aea4..792c4b2a8a 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1055,7 +1055,7 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     // Notify UI of new or updated transaction
     NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);
 
-#if defined(HAVE_SYSTEM)
+#if HAVE_SYSTEM
     // notify an external script when a wallet transaction comes in or is updated
     std::string strCmd = gArgs.GetArg("-walletnotify", "");