diff --git a/src/options.zig b/src/options.zig
index 3de2f29902..35972145fe 100644
--- a/src/options.zig
+++ b/src/options.zig
@@ -1909,8 +1909,13 @@ pub const BundleOptions = struct {
         this.defines_loaded = true;
     }
 
-    pub fn deinit(this: *const BundleOptions) void {
+    pub fn deinit(this: *BundleOptions, allocator: std.mem.Allocator) void {
         this.define.deinit();
+        // Free bundler_feature_flags if it was allocated (not the static empty set)
+        if (this.bundler_feature_flags != &Runtime.Features.empty_bundler_feature_flags) {
+            @constCast(this.bundler_feature_flags).deinit();
+            allocator.destroy(@constCast(this.bundler_feature_flags));
+        }
     }
 
     pub fn loader(this: *const BundleOptions, ext: string) Loader {
diff --git a/src/transpiler.zig b/src/transpiler.zig
index 209f35804c..34990315a0 100644
--- a/src/transpiler.zig
+++ b/src/transpiler.zig
@@ -438,7 +438,7 @@ pub const Transpiler = struct {
     }
 
     pub fn deinit(this: *Transpiler) void {
-        this.options.deinit();
+        this.options.deinit(this.allocator);
         this.log.deinit();
         this.resolver.deinit();
         this.fs.deinit();