diff --git a/src/lib/util/chd.c b/src/lib/util/chd.c
index dd373c05c6a..70510531db0 100644
--- a/src/lib/util/chd.c
+++ b/src/lib/util/chd.c
@@ -2717,6 +2717,7 @@ chd_file_compressor::hashmap::hashmap()
 chd_file_compressor::hashmap::~hashmap()
 {
 	reset();
+	delete m_block_list;
 }