diff --git a/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.directive.js b/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.directive.js
index 23c78fb5cf..8ef0be94e0 100644
--- a/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.directive.js
+++ b/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.directive.js
@@ -16,6 +16,11 @@ function atSyntaxHighlightController ($scope, AngularCodeMirror) {
 
         $scope.$watch(varName, () => {
             $scope.value = $scope[varName];
+            if ($scope.oneLine && $scope.value && $scope.value.includes('\n')) {
+                $scope.hasNewlineError = true;
+            } else {
+                $scope.hasNewlineError = false;
+            }
         });
     }
 
@@ -84,6 +89,7 @@ function atCodeMirrorTextarea () {
             init: '=',
             default: '@',
             rows: '@',
+            oneLine: '@',
             mode: '@',
         }
     };
diff --git a/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.partial.html b/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.partial.html
index 0efa81b061..595021035a 100644
--- a/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.partial.html
+++ b/awx/ui/client/lib/components/syntax-highlight/syntax-highlight.partial.html
@@ -29,4 +29,5 @@
         class="form-control Form-textArea"
         id="{{ vm.name }}_codemirror">
     </textarea>
+    <div class="error" ng-show="hasNewlineError">New lines are not supported in this field</div>
 </div>
diff --git a/awx/ui/client/src/notifications/notificationTemplates.form.js b/awx/ui/client/src/notifications/notificationTemplates.form.js
index bb02c7f43c..cfed7fc3d7 100644
--- a/awx/ui/client/src/notifications/notificationTemplates.form.js
+++ b/awx/ui/client/src/notifications/notificationTemplates.form.js
@@ -610,6 +610,7 @@ export default ['i18n', function(i18n) {
                 default: '',
                 ngShow: "customize_messages && notification_type.value != 'webhook'",
                 rows: 2,
+                oneLine: 'true',
                 ngDisabled: '!(notification_template.summary_fields.user_capabilities.edit || canAdd)',
             },
             started_body: {
@@ -632,6 +633,7 @@ export default ['i18n', function(i18n) {
                 default: '',
                 ngShow: "customize_messages && notification_type.value != 'webhook'",
                 rows: 2,
+                oneLine: 'true',
                 ngDisabled: '!(notification_template.summary_fields.user_capabilities.edit || canAdd)',
             },
             success_body: {
@@ -654,6 +656,7 @@ export default ['i18n', function(i18n) {
                 default: '',
                 ngShow: "customize_messages && notification_type.value != 'webhook'",
                 rows: 2,
+                oneLine: 'true',
                 ngDisabled: '!(notification_template.summary_fields.user_capabilities.edit || canAdd)',
             },
             error_body: {
diff --git a/awx/ui/client/src/shared/form-generator.js b/awx/ui/client/src/shared/form-generator.js
index c8eed8ebea..5f0330b4b2 100644
--- a/awx/ui/client/src/shared/form-generator.js
+++ b/awx/ui/client/src/shared/form-generator.js
@@ -1369,6 +1369,7 @@ angular.module('FormGenerator', [GeneratorHelpers.name, 'Utilities', listGenerat
                         html += `value="${fld}" `;
                         html += `default="${field.default || ''}" `;
                         html += `rows="${field.rows || 6}" `;
+                        html += `one-line="${field.oneLine || ''}"`;
                         html += `mode="${field.mode}" `;
                         html += `ng-disabled="${field.ngDisabled}" `;
                         html += '></at-syntax-highlight>';