diff --git a/compiler/can/src/def.rs b/compiler/can/src/def.rs
index 1838f26fae..fe82944005 100644
--- a/compiler/can/src/def.rs
+++ b/compiler/can/src/def.rs
@@ -280,12 +280,15 @@ pub fn canonicalize_defs<'a>(
                     );
                 }
 
+                scope.add_alias(symbol, ann.region, can_vars.clone(), can_ann.typ.clone());
+
                 let alias = roc_types::types::Alias {
                     region: ann.region,
                     vars: can_vars,
                     uniqueness: None,
                     typ: can_ann.typ,
                 };
+
                 aliases.insert(symbol, alias);
             }
             other => value_defs.push(other),