diff --git a/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in b/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
index e7fdcd35f..e0c9bf971 100644
--- a/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
+++ b/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
@@ -42,6 +42,7 @@ our @ISA = qw(Exporter ZoneMinder::Base);
 # will save memory.
 our %EXPORT_TAGS = (
     constants => [ qw(
+      STATE_UNKNOWN
       STATE_IDLE
       STATE_PREALARM
       STATE_ALARM
@@ -98,11 +99,12 @@ our $VERSION = $ZoneMinder::Base::VERSION;
 use ZoneMinder::Config qw(:all);
 use ZoneMinder::Logger qw(:all);
 
-use constant STATE_IDLE     => 0;
-use constant STATE_PREALARM => 1;
-use constant STATE_ALARM    => 2;
-use constant STATE_ALERT    => 3;
-use constant STATE_TAPE     => 4;
+use constant STATE_UNKNOWN  => 0;
+use constant STATE_IDLE     => 1;
+use constant STATE_PREALARM => 2;
+use constant STATE_ALARM    => 3;
+use constant STATE_ALERT    => 4;
+use constant STATE_TAPE     => 5;
 
 use constant ACTION_GET     => 1;
 use constant ACTION_SET     => 2;