diff --git a/matrix.c b/matrix.c
index 045b601..3552da8 100644
--- a/matrix.c
+++ b/matrix.c
@@ -75,7 +75,7 @@ void clearMatrix(Matrix *matrix)
 {
     for (int i = 0; i < matrix->rows; i++) {
         for (int j = 0; j < matrix->cols;j++) {
-            matrix->buffer[i-1 + matrix->rows*(j-1)] = UNDEFINED_MATRIX_VALUE;
+            matrix->buffer[i + matrix->rows* j] = UNDEFINED_MATRIX_VALUE;
         }
     }
     free(matrix->buffer);