diff --git a/src/main.zig b/src/main.zig
index b7ad9c8..4b7d72b 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1082,10 +1082,14 @@ pub fn main() !void {
     defer state.custom_info.deinit(state.allocator);
 
     var lblIter = custom.labels.iterator();
+    // NOTE: Because widgets have a pointer to the underlying Label, we have to ensure
+    // that the ArrayList doesn't allocate more memory than what we ensured. Otherwise
+    // the pointer to the Label becomes invalid.
+    try state.custom_info.ensureTotalCapacity(state.allocator, @intCast(custom.labels.count()));
     while (lblIter.next()) |i| {
         try state.custom_info.append(state.allocator, .{
             .info = i.value_ptr.*,
-            .lbl = .init("", null, state.buffer.fg, state.buffer.bg, &updateCustomInfo, null),
+            .lbl = .init("", null, state.buffer.fg, state.buffer.bg, updateCustomInfo, null),
         });
         var latest = &state.custom_info.items[state.custom_info.items.len - 1];
         latest.info.id = latest.lbl.widget().id;