diff --git a/src/util/memory_manager.cpp b/src/util/memory_manager.cpp
index 85d673f7c..a2c8e31a4 100644
--- a/src/util/memory_manager.cpp
+++ b/src/util/memory_manager.cpp
@@ -17,6 +17,10 @@ Copyright (c) 2015 Microsoft Corporation
 # include <malloc.h>
 # define HAS_MALLOC_USABLE_SIZE
 #endif
+#ifdef __FreeBSD__
+# include <malloc_np.h>
+# define HAS_MALLOC_USABLE_SIZE
+#endif
 
 // The following two function are automatically generated by the mk_make.py script.
 // The script collects ADD_INITIALIZER and ADD_FINALIZER commands in the .h files.