diff --git a/CHANGES.rst b/CHANGES.rst
index c36cb9a133..35a936024e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -41,6 +41,8 @@ Bug Fixes
 Cubeviz
 ^^^^^^^
 
+- Fixed validation message of moment number in moment map plugin. [#1536]
+
 Imviz
 ^^^^^
 
diff --git a/jdaviz/configs/cubeviz/plugins/moment_maps/moment_maps.vue b/jdaviz/configs/cubeviz/plugins/moment_maps/moment_maps.vue
index c4af339662..2cb5aefd9f 100644
--- a/jdaviz/configs/cubeviz/plugins/moment_maps/moment_maps.vue
+++ b/jdaviz/configs/cubeviz/plugins/moment_maps/moment_maps.vue
@@ -30,7 +30,8 @@
         v-model.number="n_moment"
         hint="The desired moment."
         persistent-hint
-        :rules="[() => !!n_moment || 'This field is required']"
+        :rules="[() => n_moment !== '' || 'This field is required',
+                 () => n_moment >=0 || 'Moment must be positive']"
       ></v-text-field>
     </v-row>