diff --git a/src/format/NXmxFormat.cpp b/src/format/NXmxFormat.cpp
index d9d29e4..a1b52f0 100644
--- a/src/format/NXmxFormat.cpp
+++ b/src/format/NXmxFormat.cpp
@@ -16,6 +16,7 @@ class NXmxFormat : public H5Format
     shared_ptr<h5_group> file_format = NULL;
 
     public:
+        ~NXmxFormat(){};
 
         NXmxFormat()
         {