diff --git a/doc/src/fix_halt.rst b/doc/src/fix_halt.rst
index 9836679de3..0bc3154cdb 100644
--- a/doc/src/fix_halt.rst
+++ b/doc/src/fix_halt.rst
@@ -160,7 +160,7 @@ the :doc:`run <run>` command.
 
 Restrictions
 """"""""""""
-The *diskfree* attribute is currently only supported on Linux and MacOS.
+The *diskfree* attribute is currently only supported on Linux, MacOSX, and BSD.
 
 Related commands
 """"""""""""""""
diff --git a/src/fix_halt.cpp b/src/fix_halt.cpp
index 7de2b9bc3a..42b63c69f1 100644
--- a/src/fix_halt.cpp
+++ b/src/fix_halt.cpp
@@ -306,12 +306,12 @@ double FixHalt::tlimit()
 /* ----------------------------------------------------------------------
    determine available disk space, if supported. Return -1 if not.
 ------------------------------------------------------------------------- */
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__)
 #include <sys/statvfs.h>
 #endif
 double FixHalt::diskfree()
 {
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__)
   struct statvfs fs;
   double disk_free = -1.0;
 
@@ -321,7 +321,7 @@ double FixHalt::diskfree()
     if (rv == 0) {
 #if defined(__linux__)
       disk_free = fs.f_bavail*fs.f_bsize/1048576.0;
-#elif defined(__APPLE__)
+#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__)
       disk_free = fs.f_bavail*fs.f_frsize/1048576.0;
 #endif
     } else