diff --git a/adoc/headers/group.h b/adoc/headers/group.h
index 3f897ffb..6c91691a 100644
--- a/adoc/headers/group.h
+++ b/adoc/headers/group.h
@@ -10,6 +10,8 @@ template <int Dimensions = 1> class group {
   static constexpr int dimensions = Dimensions;
   static constexpr memory_scope fence_scope = memory_scope::work_group;
 
+  group() = delete;
+
   /* -- common interface members -- */
 
   id<Dimensions> get_group_id() const;
diff --git a/adoc/headers/subgroup.h b/adoc/headers/subgroup.h
index ec6a0320..f47b5e77 100644
--- a/adoc/headers/subgroup.h
+++ b/adoc/headers/subgroup.h
@@ -10,6 +10,8 @@ class sub_group {
   static constexpr int dimensions = 1;
   static constexpr memory_scope fence_scope = memory_scope::sub_group;
 
+  sub_group() = delete;
+
   /* -- common interface members -- */
 
   id<1> get_group_id() const;