diff --git a/kernel/build.zig b/kernel/build.zig
index 92dfce2..9a11d31 100644
--- a/kernel/build.zig
+++ b/kernel/build.zig
@@ -148,6 +148,7 @@ fn fileExtEql(name: []const u8, ext: []const u8) bool {
 fn findSources(dir: []const u8, ext: []const u8, prefix: ?[]const u8) ![][] const u8 {
     var files = std.ArrayList([]const u8).init(alloc);
     var walker = try std.fs.walkPath(alloc, dir);
+    defer walker.deinit();
     while (try walker.next()) |entry| {
         if(entry.kind != std.fs.Dir.Entry.Kind.File) continue;