diff --git a/src/renderer.zig b/src/renderer.zig
index 7248657..ec1cc0a 100644
--- a/src/renderer.zig
+++ b/src/renderer.zig
@@ -163,7 +163,14 @@ pub const Renderer = struct {
                 for (node.variable.?.filters) |f| {
                     const filter_fn = builtin_filters.get(f.name) orelse return error.UnknownFilter;
 
-                    const arg = if (f.arg) |a| Value{ .string = a } else null;
+                    // const arg = if (f.arg) |a| Value{ .string = a } else null;
+                    var arg: Value = Value.null;
+                    if (f.arg) |a| {
+                        arg = Value{ .string = a };
+                        const result = try std.fmt.parseInt(i64, a, 10);
+                        if (std.math.maxInt(i64) < result) return error.Overflow;
+                        arg = Value{ .int = result };
+                    }
                     value = try filter_fn(alloc, value, arg);
 
                     if (std.mem.eql(u8, f.name, "safe")) is_safe = true;