diff --git a/src/tetras-back b/src/tetras-back
index 6bf991e10ad4c5eef6545365b25d26ad67d07509..fd5b011c30aa4938807ad99533f2189007a2a59d 100755
--- a/src/tetras-back
+++ b/src/tetras-back
@@ -147,6 +147,8 @@ sub notify(){
     }
 }
 
+sub do_sendmail($$$);
+
 # Send subject, message by email to root
 sub do_sendmail($$$){
     my ($subject, $message, $retry) = @_;