diff --git a/src/root.zig b/src/root.zig
index 80a2287..9eadbe3 100644
--- a/src/root.zig
+++ b/src/root.zig
@@ -433,5 +433,9 @@ pub fn Empty(comptime T: type) type {
         pub fn next(_: Empty(T)) ?Item {
             return null;
         }
+
+        pub fn sizeHint(_: *const Empty(T)) usize {
+            return 0;
+        }
     };
 }