diff --git a/src/main/java/com/mattrixwv/matrix/LongMatrix.java b/src/main/java/com/mattrixwv/matrix/LongMatrix.java
index 64652c0..fdceace 100644
--- a/src/main/java/com/mattrixwv/matrix/LongMatrix.java
+++ b/src/main/java/com/mattrixwv/matrix/LongMatrix.java
@@ -508,7 +508,7 @@ public class LongMatrix{
 		for(int leftRow = 0;leftRow < grid.length;++leftRow){
 			for(int rightCol = 0;rightCol < rightSide.getNumCols();++rightCol){
 				//Get a sum of the product of each column in the current row (left) and each row in the current column (right)
-				int elementProductSum = 0;
+				long elementProductSum = 0;
 				for(int incrementCounter = 0;incrementCounter < grid.length;++incrementCounter){
 					elementProductSum += grid[leftRow][incrementCounter] * rightSide.grid[incrementCounter][rightCol];
 				}