diff --git a/src/snmalloc/mem/backend_concept.h b/src/snmalloc/mem/backend_concept.h
index 215db1c..167836a 100644
--- a/src/snmalloc/mem/backend_concept.h
+++ b/src/snmalloc/mem/backend_concept.h
@@ -81,7 +81,7 @@ namespace snmalloc
    */
   template<typename Pagemap>
   concept IsWritablePagemapWithRegister =
-    IsReadablePagemap<Pagemap>&& IsPagemapWithRegister<Pagemap>;
+    IsWritablePagemap<Pagemap>&& IsPagemapWithRegister<Pagemap>;
 
   /**
    * The configuration also defines domestication (that is, the difference