diff --git a/macosx/PiecesView.mm b/macosx/PiecesView.mm
index a50af2e94..7d58972b6 100644
--- a/macosx/PiecesView.mm
+++ b/macosx/PiecesView.mm
@@ -2,6 +2,8 @@
 // It may be used under the MIT (SPDX: MIT) license.
 // License text can be found in the licenses/ folder.
 
+#include <vector>
+
 #include <libtransmission/transmission.h>
 #include <libtransmission/utils.h>
 
@@ -26,7 +28,7 @@ enum
 
 @interface PiecesView ()
 
-@property(nonatomic) int8_t* fPieces;
+@property(nonatomic) std::vector<int8_t> fPieces;
 
 @property(nonatomic) NSInteger fNumPieces;
 @property(nonatomic) NSInteger fAcross;
@@ -57,7 +59,6 @@ enum
 
 - (void)dealloc
 {
-    tr_free(_fPieces);
 }
 
 - (void)setTorrent:(Torrent*)torrent
@@ -84,8 +85,7 @@ enum
 
 - (void)clearView
 {
-    tr_free(self.fPieces);
-    self.fPieces = NULL;
+    self.fPieces.clear();
 }
 
 - (void)updateView
@@ -96,25 +96,25 @@ enum
     }
 
     //determine if first time
-    BOOL const first = self.fPieces == NULL;
+    BOOL const first = std::empty(self.fPieces);
     if (first)
     {
-        self.fPieces = (int8_t*)tr_malloc(self.fNumPieces * sizeof(int8_t));
+        self.fPieces.resize(self.fNumPieces);
     }
 
-    int8_t* pieces = NULL;
-    float* piecesPercent = NULL;
+    auto pieces = std::vector<int8_t>{};
+    auto piecesPercent = std::vector<float>{};
 
     BOOL const showAvailability = [NSUserDefaults.standardUserDefaults boolForKey:@"PiecesViewShowAvailability"];
     if (showAvailability)
     {
-        pieces = (int8_t*)tr_malloc(self.fNumPieces * sizeof(int8_t));
-        [self.torrent getAvailability:pieces size:self.fNumPieces];
+        pieces.resize(self.fNumPieces);
+        [self.torrent getAvailability:std::data(pieces) size:std::size(pieces)];
     }
     else
     {
-        piecesPercent = (float*)tr_malloc(self.fNumPieces * sizeof(float));
-        [self.torrent getAmountFinished:piecesPercent size:self.fNumPieces];
+        piecesPercent.resize(self.fNumPieces);
+        [self.torrent getAmountFinished:std::data(piecesPercent) size:std::size(piecesPercent)];
     }
 
     NSImage* image = self.image;
@@ -193,9 +193,6 @@ enum
         [image unlockFocus];
         [self setNeedsDisplay];
     }
-
-    tr_free(pieces);
-    tr_free(piecesPercent);
 }
 
 - (BOOL)acceptsFirstMouse:(NSEvent*)event
diff --git a/macosx/Torrent.mm b/macosx/Torrent.mm
index f21b63dad..ae276dd29 100644
--- a/macosx/Torrent.mm
+++ b/macosx/Torrent.mm
@@ -3,6 +3,7 @@
 // License text can be found in the licenses/ folder.
 
 #include <optional>
+#include <vector>
 
 #include <fmt/format.h>
 
@@ -1535,14 +1536,14 @@ bool trashDataFile(char const* filename, tr_error** error)
 - (void)setFilePriority:(tr_priority_t)priority forIndexes:(NSIndexSet*)indexSet
 {
     NSUInteger const count = indexSet.count;
-    tr_file_index_t* files = static_cast<tr_file_index_t*>(tr_malloc(count * sizeof(tr_file_index_t)));
+    auto files = std::vector<tr_file_index_t>{};
+    files.resize(count);
     for (NSUInteger index = indexSet.firstIndex, i = 0; index != NSNotFound; index = [indexSet indexGreaterThanIndex:index], i++)
     {
         files[i] = index;
     }
 
-    tr_torrentSetFilePriorities(self.fHandle, files, count, priority);
-    tr_free(files);
+    tr_torrentSetFilePriorities(self.fHandle, std::data(files), std::size(files), priority);
 }
 
 - (BOOL)hasFilePriority:(tr_priority_t)priority forIndexes:(NSIndexSet*)indexSet
diff --git a/qt/RpcClient.cc b/qt/RpcClient.cc
index 1b5ca27db..90b1d6f71 100644
--- a/qt/RpcClient.cc
+++ b/qt/RpcClient.cc
@@ -16,7 +16,6 @@
 
 #include <libtransmission/rpcimpl.h>
 #include <libtransmission/transmission.h>
-#include <libtransmission/utils.h> // tr_free
 #include <libtransmission/version.h> // LONG_VERSION_STRING
 
 #include "VariantHelpers.h"
@@ -31,15 +30,14 @@ namespace
 char const constexpr* const RequestDataPropertyKey{ "requestData" };
 char const constexpr* const RequestFutureinterfacePropertyKey{ "requestReplyFutureInterface" };
 
-void destroyVariant(tr_variant* json)
-{
-    tr_variantFree(json);
-    tr_free(json);
-}
-
 TrVariantPtr createVariant()
 {
-    return { tr_new0(tr_variant, 1), &destroyVariant };
+    return { new tr_variant{},
+             [](tr_variant* var)
+             {
+                 tr_variantFree(var);
+                 delete var;
+             } };
 }
 
 } // namespace