diff --git a/plugins/other/hddtemp_smartctl b/plugins/other/hddtemp_smartctl
index 9c73668f..f5c61f7f 100755
--- a/plugins/other/hddtemp_smartctl
+++ b/plugins/other/hddtemp_smartctl
@@ -139,7 +139,7 @@ if ($^O eq 'linux') {
   # without probing them.
 } elsif ($^O eq 'freebsd') {
   opendir(DEV, '/dev');
-  @drives = grep /^ad[0-9]+$/, readdir DEV;
+  @drives = grep /^(a?da|ad)[0-9]+$/, readdir DEV;
   closedir(DEV);
 } elsif ($^O eq 'solaris') {
   @drives = map { s@.*/@@ ; $_ } glob '/dev/rdsk/c*t*d*s2';