diff --git a/core/api/src/main/java/org/onosproject/net/optical/OmsPort.java b/core/api/src/main/java/org/onosproject/net/optical/OmsPort.java
index a08ab5f..898fce9 100644
--- a/core/api/src/main/java/org/onosproject/net/optical/OmsPort.java
+++ b/core/api/src/main/java/org/onosproject/net/optical/OmsPort.java
@@ -37,7 +37,7 @@
      */
     default short totalChannels() {
         Frequency diff = maxFrequency().subtract(minFrequency());
-        return (short) (diff.asHz() / grid().asHz());
+        return (short) (diff.asHz() / grid().asHz() + 1);
     }
 
     /**