diff --git a/include/zipr_mem_space.h b/include/zipr_mem_space.h
index a9c9b1994c1d61ccfd849fe84e931fdb6abc1554..37b7f9e8cfdf9e69c1177f527b0bd1461e9ec64f 100644
--- a/include/zipr_mem_space.h
+++ b/include/zipr_mem_space.h
@@ -48,6 +48,7 @@ class ZiprMemorySpace_t : public MemorySpace_t
 		// range operatations
 		void SplitFreeRange(RangeAddress_t addr);
 		void SplitFreeRange(Range_t split_from);
+		void MergeFreeRange(Range_t range);
 		void MergeFreeRange(RangeAddress_t addr);
 		RangeSet_t::iterator FindFreeRange(RangeAddress_t addr);
 		Range_t GetFreeRange(int size);