diff --git a/app/call_center/call_center_queue_edit.php b/app/call_center/call_center_queue_edit.php
index 497bb9fa19..f183a65fef 100644
--- a/app/call_center/call_center_queue_edit.php
+++ b/app/call_center/call_center_queue_edit.php
@@ -793,7 +793,7 @@ if (count($_POST)>0 && strlen($_POST["persistformvar"]) == 0) {
 	echo "	".$text['label-max_wait_time_with_no_agent']."\n";
 	echo "</td>\n";
 	echo "<td class='vtable' align='left'>\n";
-	echo "  <input class='formfld' type='number' name='queue_max_wait_time_with_no_agent' maxlength='255' min='1' step='1' value='$queue_max_wait_time_with_no_agent'>\n";
+	echo "  <input class='formfld' type='number' name='queue_max_wait_time_with_no_agent' maxlength='255' min='0' step='1' value='$queue_max_wait_time_with_no_agent'>\n";
 	echo "<br />\n";
 	echo $text['description-max_wait_time_with_no_agent']."\n";
 	echo "</td>\n";
@@ -804,7 +804,7 @@ if (count($_POST)>0 && strlen($_POST["persistformvar"]) == 0) {
 	echo "	".$text['label-max_wait_time_with_no_agent_time_reached']."\n";
 	echo "</td>\n";
 	echo "<td class='vtable' align='left'>\n";
-	echo "  <input class='formfld' type='number' name='queue_max_wait_time_with_no_agent_time_reached' maxlength='255' min='1' step='1' value='$queue_max_wait_time_with_no_agent_time_reached'>\n";
+	echo "  <input class='formfld' type='number' name='queue_max_wait_time_with_no_agent_time_reached' maxlength='255' min='0' step='1' value='$queue_max_wait_time_with_no_agent_time_reached'>\n";
 	echo "<br />\n";
 	echo $text['description-max_wait_time_with_no_agent_time_reached']."\n";
 	echo "</td>\n";
@@ -851,7 +851,7 @@ if (count($_POST)>0 && strlen($_POST["persistformvar"]) == 0) {
 	echo "	".$text['label-tier_rule_wait_second']."\n";
 	echo "</td>\n";
 	echo "<td class='vtable' align='left'>\n";
-	echo "  <input class='formfld' type='number' name='queue_tier_rule_wait_second' maxlength='255' min='1' step='1' value='$queue_tier_rule_wait_second'>\n";
+	echo "  <input class='formfld' type='number' name='queue_tier_rule_wait_second' maxlength='255' min='0' step='1' value='$queue_tier_rule_wait_second'>\n";
 	echo "<br />\n";
 	echo $text['description-tier_rule_wait_second']."\n";
 	echo "</td>\n";
@@ -910,7 +910,7 @@ if (count($_POST)>0 && strlen($_POST["persistformvar"]) == 0) {
 	echo "	".$text['label-discard_abandoned_after']."\n";
 	echo "</td>\n";
 	echo "<td class='vtable' align='left'>\n";
-	echo "  <input class='formfld' type='number' name='queue_discard_abandoned_after' maxlength='255' min='1' step='1' value='$queue_discard_abandoned_after'>\n";
+	echo "  <input class='formfld' type='number' name='queue_discard_abandoned_after' maxlength='255' min='0' step='1' value='$queue_discard_abandoned_after'>\n";
 	echo "<br />\n";
 	echo $text['description-discard_abandoned_after']."\n";
 	echo "</td>\n";