diff --git a/src/custom.zig b/src/custom.zig
index 2fc5a09..1b8b3a6 100644
--- a/src/custom.zig
+++ b/src/custom.zig
@@ -9,7 +9,8 @@ const RunBuffers = plugins.RunBuffers;
 
 pub const RandomNoise = struct {
     r: std.rand.DefaultPrng,
-    rand_buf: ?[]f32,
+    rand_buf: ?[]f32 = null,
+    allocator: ?*std.mem.Allocator = null,
     cnt: usize = 0,
 
     pub fn init(
@@ -30,16 +31,22 @@ pub const RandomNoise = struct {
 
             return RandomNoise{
                 .r = r,
+                .allocator = allocator,
                 .rand_buf = rand_buf,
             };
         } else {
             return RandomNoise{
                 .r = r,
-                .rand_buf = null,
             };
         }
     }
 
+    pub fn deinit(self: *RandomNoise) void {
+        if (self.allocator == null) return;
+        if (self.rand_buf == null) return;
+        self.allocator.?.free(self.rand_buf.?);
+    }
+
     pub fn run(self: *RandomNoise, bufs: *RunBuffers) void {
         if (self.rand_buf) |rand_buf| {
             if (self.cnt >= rand_buf.len) self.cnt = 0;
@@ -53,7 +60,8 @@ pub const RandomNoise = struct {
 
 pub const WildNoise = struct {
     r: std.rand.DefaultPrng,
-    rand_buf: ?[]f32,
+    rand_buf: ?[]f32 = null,
+    allocator: ?*std.mem.Allocator = null,
     cnt: usize = 0,
 
     pub fn init(
@@ -79,11 +87,16 @@ pub const WildNoise = struct {
         } else {
             return WildNoise{
                 .r = r,
-                .rand_buf = null,
             };
         }
     }
 
+    pub fn deinit(self: *RandomNoise) void {
+        if (self.allocator == null) return;
+        if (self.rand_buf == null) return;
+        self.allocator.?.free(self.rand_buf.?);
+    }
+
     pub fn run(self: *WildNoise, bufs: *RunBuffers) void {
         if (self.rand_buf) |rand_buf| {
             if (self.cnt >= rand_buf.len) self.cnt = 0;
@@ -107,7 +120,6 @@ pub const Write = struct {
         params: *plugins.ParamMap,
     ) Write {
         const data = params.get("data").?;
-
         return Write{
             .data = data.value,
         };
diff --git a/src/image.zig b/src/image.zig
index 1898f28..e42bca7 100644
--- a/src/image.zig
+++ b/src/image.zig
@@ -69,6 +69,7 @@ fn sf_tell(file: *c.SNDFILE) i64 {
     return -frames;
 }
 
+/// Caller owns the returned memory.
 pub fn temporaryName(allocator: *std.mem.Allocator) ![]u8 {
     const template_start = "/temp/temp_";
     const template = "/tmp/temp_XXXXXXXXXXX";
diff --git a/src/plugin.zig b/src/plugin.zig
index c403eb7..1de854f 100644
--- a/src/plugin.zig
+++ b/src/plugin.zig
@@ -141,6 +141,7 @@ pub const RunContext = struct {
 
 pub fn makeContext(allocator: *std.mem.Allocator, plugin_uri: []const u8) !Context {
     const cstr_plugin_uri = try std.cstr.addNullByte(allocator, plugin_uri);
+    defer allocator.free(cstr_plugin_uri);
 
     var world: *c.LilvWorld = c.lilv_world_new().?;
     errdefer c.lilv_world_free(world);