diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 24128cf0b..01f54bd7b 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2534,7 +2534,7 @@ void CWallet::ClearNoteWitnessCache()
 }
 
 template<typename NoteDataMap>
-void UpdateSpentHeightAndMaybePruneWitnesses(NoteDataMap& noteDataMap, int indexHeight, const uint256& nullifier)
+static void UpdateSpentHeightAndMaybePruneWitnesses(NoteDataMap& noteDataMap, int indexHeight, const uint256& nullifier)
 {
     for (auto& item : noteDataMap) {
         auto* nd = &(item.second);
@@ -2565,7 +2565,7 @@ void UpdateSpentHeightAndMaybePruneWitnesses(NoteDataMap& noteDataMap, int index
 }
 
 template<typename NoteDataMap>
-void CopyPreviousWitnesses(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
+static void CopyPreviousWitnesses(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
 {
     for (auto& item : noteDataMap) {
         auto* nd = &(item.second);
@@ -2596,7 +2596,7 @@ void CopyPreviousWitnesses(NoteDataMap& noteDataMap, int indexHeight, int64_t nW
 }
 
 template<typename NoteDataMap>
-void AppendNoteCommitment(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize, const uint256& note_commitment)
+static void AppendNoteCommitment(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize, const uint256& note_commitment)
 {
     for (auto& item : noteDataMap) {
         auto* nd = &(item.second);
@@ -2610,7 +2610,7 @@ void AppendNoteCommitment(NoteDataMap& noteDataMap, int indexHeight, int64_t nWi
 }
 
 template<typename OutPoint, typename NoteData, typename Witness>
-void WitnessNoteIfMine(std::map<OutPoint, NoteData>& noteDataMap, int indexHeight, int64_t nWitnessCacheSize, const OutPoint& key, const Witness& witness)
+static void WitnessNoteIfMine(std::map<OutPoint, NoteData>& noteDataMap, int indexHeight, int64_t nWitnessCacheSize, const OutPoint& key, const Witness& witness)
 {
     if (noteDataMap.count(key) && noteDataMap[key].witnessHeight < indexHeight) {
         auto* nd = &(noteDataMap[key]);
@@ -2641,7 +2641,7 @@ void WitnessNoteIfMine(std::map<OutPoint, NoteData>& noteDataMap, int indexHeigh
 
 
 template<typename NoteDataMap>
-void UpdateWitnessHeights(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
+static void UpdateWitnessHeights(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
 {
     for (auto& item : noteDataMap) {
         auto* nd = &(item.second);
@@ -2786,7 +2786,7 @@ void CWallet::IncrementNoteWitnesses(
 }
 
 template<typename NoteDataMap>
-void DecrementNoteWitnesses(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
+static void DecrementNoteWitnesses(NoteDataMap& noteDataMap, int indexHeight, int64_t nWitnessCacheSize)
 {
     for (auto& item : noteDataMap) {
         auto* nd = &(item.second);