diff --git a/src/lib.zig b/src/lib.zig
index 285892e5d7ee09fe9e732d4e953e90f6c0c29202..fa69f7ff0e40b06b9e3c1a7c70bf31a69ae6dfa0 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -14,7 +14,7 @@ const std = @import("std");
 //     );
 // }
 
-pub fn leven(comptime T: type, alloc: std.mem.Allocator, a: []const T, b: []const T, max: ?usize) !usize {
+pub fn leven(comptime T: type, backing_alloc: std.mem.Allocator, a: []const T, b: []const T, max: ?usize) !usize {
     if (std.mem.eql(T, a, b)) return 0;
 
     var left = a;
@@ -46,6 +46,9 @@ pub fn leven(comptime T: type, alloc: std.mem.Allocator, a: []const T, b: []cons
 
     var result: usize = 0;
 
+    var sfa = std.heap.stackFallback(4096, backing_alloc);
+    const alloc = sfa.get();
+
     const charCodeCache = try alloc.alloc(T, ll);
     defer alloc.free(charCodeCache);