diff --git a/src/vcl/vcl_private.c b/src/vcl/vcl_private.c
index 847e32c..059acdf 100644
--- a/src/vcl/vcl_private.c
+++ b/src/vcl/vcl_private.c
@@ -479,7 +479,7 @@
 
   clib_rwlock_writer_unlock (&vcm->segment_table_lock);
 
-  VDBG (0, "detached segment %u handle %u", segment_index, segment_handle);
+  VDBG (0, "detached segment %u handle %lx", segment_index, segment_handle);
 }
 
 void