diff --git a/view/js/main.js b/view/js/main.js
index 3370d7ccd..cd09de014 100644
--- a/view/js/main.js
+++ b/view/js/main.js
@@ -793,11 +793,25 @@ function profChangeMember(gid,cid) {
 	});
 }
 
-function contactgroupChangeMember(gid,cid) {
+function contactgroupChangeMember(checkbox, gid, cid) {
+	let url;
+	// checkbox.checked is the checkbox state after the click
+	if (checkbox.checked) {
+		url = 'group/' + gid + '/add/' + cid;
+	} else {
+		url = 'group/' + gid + '/remove/' + cid;
+	}
 	$('body').css('cursor', 'wait');
-	$.get('contactgroup/' + gid + '/' + cid, function(data) {
-			$('body').css('cursor', 'auto');
+	$.post(url)
+	.error(function () {
+		// Restores previous state in case of error
+		checkbox.checked = !checkbox.checked;
+	})
+	.always(function() {
+		$('body').css('cursor', 'auto');
 	});
+
+	return true;
 }
 
 function checkboxhighlight(box) {
diff --git a/view/templates/group_side.tpl b/view/templates/group_side.tpl
index 5796bb735..31b9287ba 100644
--- a/view/templates/group_side.tpl
+++ b/view/templates/group_side.tpl
@@ -9,7 +9,7 @@
 					{{if $group.cid}}
 						<input type="checkbox"
 							class="{{if $group.selected}}ticked{{else}}unticked {{/if}} action"
-							onclick="contactgroupChangeMember('{{$group.id}}','{{$group.cid}}');return true;"
+							onclick="return contactgroupChangeMember(this, '{{$group.id}}','{{$group.cid}}');"
 							{{if $group.ismember}}checked="checked"{{/if}}
 						/>
 					{{/if}}
diff --git a/view/theme/frio/templates/group_side.tpl b/view/theme/frio/templates/group_side.tpl
index 947ae974e..75983b36e 100644
--- a/view/theme/frio/templates/group_side.tpl
+++ b/view/theme/frio/templates/group_side.tpl
@@ -28,7 +28,7 @@
 							<input type="checkbox"
 								id="sidebar-group-checkbox-{{$group.id}}"
 								class="{{if $group.selected}}ticked{{else}}unticked {{/if}} action"
-								onclick="contactgroupChangeMember('{{$group.id}}','{{$group.cid}}');return true;"
+								onclick="return contactgroupChangeMember(this, '{{$group.id}}','{{$group.cid}}');"
 								{{if $group.ismember}}checked="checked"{{/if}}
 								aria-checked="{{if $group.ismember}}true{{else}}false{{/if}}"
 							/>
diff --git a/view/theme/quattro/templates/group_side.tpl b/view/theme/quattro/templates/group_side.tpl
index 620d2de75..18a6105a6 100644
--- a/view/theme/quattro/templates/group_side.tpl
+++ b/view/theme/quattro/templates/group_side.tpl
@@ -17,7 +17,7 @@
 				{{if $group.cid}}
 					<input type="checkbox"
 						class="{{if $group.selected}}ticked{{else}}unticked {{/if}} action"
-						onclick="contactgroupChangeMember('{{$group.id}}','{{$group.cid}}');return true;"
+						onclick="return contactgroupChangeMember(this, '{{$group.id}}','{{$group.cid}}');"
 						{{if $group.ismember}}checked="checked"{{/if}}
 					/>
 				{{/if}}