diff --git a/rust/candid/src/de.rs b/rust/candid/src/de.rs
index a64056fe..3b7c94e0 100644
--- a/rust/candid/src/de.rs
+++ b/rust/candid/src/de.rs
@@ -108,7 +108,7 @@ impl<'de> IDLDeserialize<'de> {
 }
 
 pub struct Config {
-    zero_sized_values: usize,
+    pub zero_sized_values: usize,
 }
 
 macro_rules! assert {