diff --git a/openbox/client.c b/openbox/client.c
index feaa24df..1aaa0267 100644
--- a/openbox/client.c
+++ b/openbox/client.c
@@ -3200,3 +3200,8 @@ ObClient* client_under_pointer()
     }
     return ret;
 }
+
+gboolean client_has_group_siblings(ObClient *self)
+{
+    return self->group && self->group->members->next;
+}
diff --git a/openbox/client.h b/openbox/client.h
index 078de272..aeb2160e 100644
--- a/openbox/client.h
+++ b/openbox/client.h
@@ -563,4 +563,6 @@ void client_update_sm_client_id(ObClient *self);
 
 ObClient* client_under_pointer();
 
+gboolean client_has_group_siblings(ObClient *self);
+
 #endif