diff --git a/matrix/SquareMatrix.hpp b/matrix/SquareMatrix.hpp
index 6b7da78eee..fe98cbefb0 100644
--- a/matrix/SquareMatrix.hpp
+++ b/matrix/SquareMatrix.hpp
@@ -15,6 +15,7 @@
 #include <math.h>
 
 #include "math.hpp"
+#include "helper_functions.hpp"
 
 namespace matrix
 {
diff --git a/matrix/math.hpp b/matrix/math.hpp
index b69d2e0eec..4a759efe63 100644
--- a/matrix/math.hpp
+++ b/matrix/math.hpp
@@ -13,3 +13,4 @@
 #include "Scalar.hpp"
 #include "Quaternion.hpp"
 #include "AxisAngle.hpp"
+#include "helper_functions.hpp"