diff --git a/src/components/Project/Infrastructure/EditActivityModal.jsx b/src/components/Project/Infrastructure/EditActivityModal.jsx
index a0077e26..e8927ae3 100644
--- a/src/components/Project/Infrastructure/EditActivityModal.jsx
+++ b/src/components/Project/Infrastructure/EditActivityModal.jsx
@@ -303,6 +303,7 @@ const EditActivityModal = ({
                   type="number"
                   className="form-control form-control-sm me-2"
                   placeholder="Completed Work"
+                  disabled={getValues("completedWork") > 0}
                 />
                 {errors.completedWork && (
                   <p className="danger-text">{errors.completedWork.message}</p>