diff --git a/hll/include/HllUnion-internal.hpp b/hll/include/HllUnion-internal.hpp
index e738fc1..716fab6 100644
--- a/hll/include/HllUnion-internal.hpp
+++ b/hll/include/HllUnion-internal.hpp
@@ -160,11 +160,6 @@
 }
 
 template<typename A>
-bool hll_union_alloc<A>::is_compact() const {
-  return gadget.is_compact();
-}
-
-template<typename A>
 bool hll_union_alloc<A>::is_empty() const {
   return gadget.is_empty();
 }
diff --git a/hll/include/hll.hpp b/hll/include/hll.hpp
index e57f886..a65b945 100644
--- a/hll/include/hll.hpp
+++ b/hll/include/hll.hpp
@@ -481,12 +481,6 @@
     target_hll_type get_target_type() const;
 
     /**
-     * Indicates if the union is currently stored compacted.
-     * @return True if the union is stored in compact form.
-     */
-    bool is_compact() const;
-
-    /**
      * Indicates if the union is currently empty.
      * @return True if the union is empty.
      */