diff --git a/src/main/java/LightBoard.java b/src/main/java/LightBoard.java
index 8c591b1..dd586fc 100644
--- a/src/main/java/LightBoard.java
+++ b/src/main/java/LightBoard.java
@@ -44,7 +44,7 @@ public boolean evaluateLight(int row, int col)
         if(lights[r][col] == true)
           sum++;
       }
-      if(sum/3 == 0)
+      if(sum%3 == 0)
         return true;
       return false;
     }