diff --git a/src/intrusive_flat_map.h b/src/intrusive_flat_map.h
index 5df4ffb2..4d1ead86 100644
--- a/src/intrusive_flat_map.h
+++ b/src/intrusive_flat_map.h
@@ -318,7 +318,7 @@ namespace etl
 
   protected:
 
-    typedef typename parameter_type<TKey>::type key_value_parameter_t;
+    typedef typename etl::parameter_type<TKey>::type key_value_parameter_t;
 
   private:
 
diff --git a/src/intrusive_flat_multimap.h b/src/intrusive_flat_multimap.h
index 8cdcea20..c95ec1e1 100644
--- a/src/intrusive_flat_multimap.h
+++ b/src/intrusive_flat_multimap.h
@@ -297,7 +297,7 @@ namespace etl
 
   protected:
 
-    typedef typename parameter_type<TKey>::type key_value_parameter_t;
+    typedef typename etl::parameter_type<TKey>::type key_value_parameter_t;
 
   private:
 
diff --git a/src/intrusive_flat_set.h b/src/intrusive_flat_set.h
index 3b57d567..f66a5c24 100644
--- a/src/intrusive_flat_set.h
+++ b/src/intrusive_flat_set.h
@@ -325,7 +325,7 @@ namespace etl
 
   protected:
 
-    typedef typename parameter_type<T>::type parameter_t;
+    typedef typename etl::parameter_type<T>::type parameter_t;
 
   public: