diff --git a/src/block.zig b/src/block.zig
index 8126700..95576f4 100644
--- a/src/block.zig
+++ b/src/block.zig
@@ -107,10 +107,12 @@ pub fn Block(
         fn descDisposeHelper(src: *anyopaque) callconv(.C) void {
             const real_src: *Context = @ptrCast(@alignCast(src));
             inline for (captures_info.fields) |field| {
-                if (field.type == objc.c.id) _Block_object_dispose(@field(real_src, field.name), 3);
-                alloc.free(std.mem.sliceTo(@field(@field(real_src, "descriptor"), "signature").?, 0));
-                alloc.destroy(@field(real_src, "descriptor"));
+                if (field.type == objc.c.id) {
+                    _Block_object_dispose(@field(real_src, field.name), 3);
+                }
             }
+            alloc.free(std.mem.sliceTo(real_src.descriptor.signature.?, 0));
+            alloc.destroy(real_src.descriptor);
         }
 
         /// Creates a function type for the invocation function, but alters