diff --git a/src/bench/checkblock.cpp b/src/bench/checkblock.cpp
index 52e5cb743..53aa47004 100644
--- a/src/bench/checkblock.cpp
+++ b/src/bench/checkblock.cpp
@@ -8,6 +8,7 @@
 #include <chainparams.h>
 #include <consensus/validation.h>
 #include <streams.h>
+#include <util/system.h>
 #include <validation.h>
 
 // These are the two major time-sinks which happen after we have fully received
diff --git a/src/index/base.cpp b/src/index/base.cpp
index 323547900..674b5cf5b 100644
--- a/src/index/base.cpp
+++ b/src/index/base.cpp
@@ -9,6 +9,7 @@
 #include <shutdown.h>
 #include <tinyformat.h>
 #include <util/syscall_sandbox.h>
+#include <util/system.h>
 #include <util/thread.h>
 #include <util/translation.h>
 #include <validation.h> // For g_chainman
diff --git a/src/index/coinstatsindex.cpp b/src/index/coinstatsindex.cpp
index 687e330fe..8930214e7 100644
--- a/src/index/coinstatsindex.cpp
+++ b/src/index/coinstatsindex.cpp
@@ -10,6 +10,7 @@
 #include <serialize.h>
 #include <txdb.h>
 #include <undo.h>
+#include <util/system.h>
 #include <validation.h>
 
 using kernel::CCoinsStats;
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 42c8b0776..2b6711ca4 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -19,6 +19,7 @@
 #include <validation.h> // for DEFAULT_SCRIPTCHECK_THREADS and MAX_SCRIPTCHECK_THREADS
 #include <netbase.h>
 #include <txdb.h> // for -dbcache defaults
+#include <util/system.h>
 
 #include <chrono>
 
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 52d5eaaa5..88ceeadea 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -39,6 +39,7 @@
 #include <univalue.h>
 #include <util/check.h>
 #include <util/strencodings.h>
+#include <util/system.h>
 #include <util/translation.h>
 #include <validation.h>
 #include <validationinterface.h>
diff --git a/src/rpc/mempool.cpp b/src/rpc/mempool.cpp
index d59ff3f75..0ae10b6c3 100644
--- a/src/rpc/mempool.cpp
+++ b/src/rpc/mempool.cpp
@@ -20,6 +20,7 @@
 #include <txmempool.h>
 #include <univalue.h>
 #include <util/moneystr.h>
+#include <util/time.h>
 
 using kernel::DumpMempool;
 
diff --git a/src/txdb.h b/src/txdb.h
index faa543b41..a04596f7b 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -8,6 +8,7 @@
 
 #include <coins.h>
 #include <dbwrapper.h>
+#include <sync.h>
 
 #include <memory>
 #include <optional>