diff --git a/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java b/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
index 1de8305..205b695 100644
--- a/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
+++ b/src/main/java/com/mattrixwv/matrix/IntegerMatrix.java
@@ -743,6 +743,10 @@ public class IntegerMatrix{
 		}
 	}
 	@Override
+	public int hashCode(){
+		return grid.hashCode();
+	}
+	@Override
 	public String toString(){
 		StringJoiner matrix = new StringJoiner("\n");
 		for(int rowCnt = 0;rowCnt < grid.length;++rowCnt){