diff --git a/src/PropertiesAns.lagda b/src/PropertiesAns.lagda
index bb9d5c98..9883bf94 100644
--- a/src/PropertiesAns.lagda
+++ b/src/PropertiesAns.lagda
@@ -5,7 +5,7 @@ permalink : /PropertiesAns
 ---
 
 \begin{code}
-open import Naturals using (ℕ; suc; zero; _+_; _*_; _∸_)
+open import Data.Nat using (ℕ; suc; zero; _+_; _*_; _∸_)
 open import Properties using (+-assoc; +-comm)
 open import Relation.Binary.PropositionalEquality using (_≡_; refl; sym)
 
diff --git a/src/RelationsAns.lagda b/src/RelationsAns.lagda
index fd6bfdcd..83d31f30 100644
--- a/src/RelationsAns.lagda
+++ b/src/RelationsAns.lagda
@@ -7,7 +7,7 @@ permalink : /RelationsAns
 ## Imports
 
 \begin{code}
-open import Naturals using (ℕ; zero; suc; _+_; _*_; _∸_)
+open import Data.Nat using (ℕ; zero; suc; _+_; _*_; _∸_)
 open import Relations using (_≤_; _<_; Trichotomy; even; odd)
 open import Properties using (+-comm; +-identity; +-suc)
 open import Relation.Binary.PropositionalEquality using (_≡_; refl; sym)