diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5c6cb6b..f5a4b338 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,20 @@
 # Changelog
 
-## v1.1.4 -2024-10-01
+## v1.1.5 - UNRELEASED
+
+### Added
+
+- N/A
+
+### Changed
+
+- **aiken-lang**: Fix data-type reification from `Void`; somehow missing from known definition :facepalm:. @KtorZ
+
+### Removed
+
+- N/A
+
+## v1.1.4 - 2024-10-01
 
 ### Added
 
diff --git a/crates/aiken-lang/src/builtins.rs b/crates/aiken-lang/src/builtins.rs
index dccffdc3..2a9c53c1 100644
--- a/crates/aiken-lang/src/builtins.rs
+++ b/crates/aiken-lang/src/builtins.rs
@@ -1486,6 +1486,16 @@ pub fn prelude_data_types(id_gen: &IdGenerator) -> IndexMap<DataTypeKey, TypedDa
         data_data_type,
     );
 
+    // Void
+    let void_data_type = TypedDataType::void();
+    data_types.insert(
+        DataTypeKey {
+            module_name: "".to_string(),
+            defined_type: well_known::VOID.to_string(),
+        },
+        void_data_type,
+    );
+
     // Ordering
     let ordering_data_type = TypedDataType::ordering();
     data_types.insert(
@@ -1569,6 +1579,10 @@ impl TypedDataType {
         DataType::known_enum(well_known::DATA, &[])
     }
 
+    pub fn void() -> Self {
+        DataType::known_enum(well_known::VOID, well_known::VOID_CONSTRUCTORS)
+    }
+
     pub fn bool() -> Self {
         DataType::known_enum(well_known::BOOL, well_known::BOOL_CONSTRUCTORS)
     }
diff --git a/crates/aiken-lang/src/expr.rs b/crates/aiken-lang/src/expr.rs
index 548a401b..0622783c 100644
--- a/crates/aiken-lang/src/expr.rs
+++ b/crates/aiken-lang/src/expr.rs
@@ -1233,7 +1233,8 @@ impl UntypedExpr {
                     }
 
                     Err(format!(
-                        "invalid type annotation {tipo:?} for {ix}{} constructor with fields: {fields:?}",
+                        "invalid type annotation {tipo:?} for {}{} constructor with fields: {fields:?}",
+                        ix + 1,
                         ordinal::Ordinal::<usize>(ix + 1).suffix(),
                     ))
                 }