diff --git a/Changes b/Changes
index 4c0a116..5a4a286 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,8 @@
+3.N.N  - DD-MMM-YYYY
+====================
+- Fixed an undeclared global symbol "$imgfmt_lc" in 'traffacct.pm'.
+
+
 3.9.0  - 14-Oct-2016
 ====================
 - Added a complete graph for Linux Traffic Control with the 'tc' command. [#74]
diff --git a/lib/traffacct.pm b/lib/traffacct.pm
index f6dadf5..c7a60ca 100644
--- a/lib/traffacct.pm
+++ b/lib/traffacct.pm
@@ -316,6 +316,7 @@ sub traffacct_sendreports {
 	my $myself = (caller(0))[3];
 	my ($config, $debug) = @_;
 	my $traffacct = $config->{traffacct};
+	my $imgfmt_lc = lc($config->{image_format});
 
 	my (undef, undef, undef, undef, $prev_month, $prev_year) = localtime(time - 3600);
 	my $n;