diff --git a/src/Matrix.cpp b/src/Matrix.cpp
index 0f74365..d06bf4e 100644
--- a/src/Matrix.cpp
+++ b/src/Matrix.cpp
@@ -471,6 +471,8 @@ namespace Aurora {
     }
 
     double& Matrix::operator[](size_t index) { return getData()[index];}
+    double Matrix::operator[](size_t index) const { return getData()[index];}
+
 
     void Matrix::printf() {
         if(isNull())