diff --git a/persistent-data/data-structures/bitset.cc b/persistent-data/data-structures/bitset.cc
index 9625dae..55b157d 100644
--- a/persistent-data/data-structures/bitset.cc
+++ b/persistent-data/data-structures/bitset.cc
@@ -46,6 +46,10 @@ namespace persistent_data {
 				return array_.get_root();
 			}
 
+			unsigned get_nr_bits() const {
+				return nr_bits_;
+			}
+
 			void grow(unsigned new_nr_bits, bool default_value) {
 				pad_last_block(default_value);
 				resize_array(new_nr_bits, default_value);
@@ -214,6 +218,12 @@ bitset::get_root() const
 	return impl_->get_root();
 }
 
+unsigned
+bitset::get_nr_bits() const
+{
+	return impl_->get_nr_bits();
+}
+
 void
 bitset::grow(unsigned new_nr_bits, bool default_value)
 {
diff --git a/persistent-data/data-structures/bitset.h b/persistent-data/data-structures/bitset.h
index 9d2b590..b143278 100644
--- a/persistent-data/data-structures/bitset.h
+++ b/persistent-data/data-structures/bitset.h
@@ -54,6 +54,7 @@ namespace persistent_data {
 		bitset(tm_ptr tm);
 		bitset(tm_ptr tm, block_address root, unsigned nr_bits);
 		block_address get_root() const;
+		unsigned get_nr_bits() const;
 		void grow(unsigned new_nr_bits, bool default_value);
 		void destroy();