diff --git a/x-pack/plugins/security_solution/public/detections/components/rules/step_define_rule/schema.tsx b/x-pack/plugins/security_solution/public/detections/components/rules/step_define_rule/schema.tsx
index 5203a630b72ae5..de2d390ee6784c 100644
--- a/x-pack/plugins/security_solution/public/detections/components/rules/step_define_rule/schema.tsx
+++ b/x-pack/plugins/security_solution/public/detections/components/rules/step_define_rule/schema.tsx
@@ -221,7 +221,7 @@ export const schema: FormSchema<DefineStepRule> = {
             message: i18n.translate(
               'xpack.securitySolution.detectionEngine.validations.thresholdValueFieldData.numberGreaterThanOrEqualOneErrorMessage',
               {
-                defaultMessage: 'Value must be greater than or equal one.',
+                defaultMessage: 'Value must be greater than or equal to one.',
               }
             ),
             allowEquality: true,