diff --git a/tests.cpp b/tests.cpp
index b2f16bb..290a773 100644
--- a/tests.cpp
+++ b/tests.cpp
@@ -1,7 +1,7 @@
 #include <cassert>
 #include <cmath>
 #include <iostream>
-#include "gamematrix.h"
+#include "gamematrix.cpp"
 
 void test_matmul_basic() {
     std::array<std::array<double,4>,4> A = {{
@@ -18,7 +18,7 @@ void test_matmul_basic() {
         {7, 7, 7, 7}
     }};
 
-    auto C = gameMatrix::matmul(A, B);
+    auto C = Matrix3D::gameMatrix::matmul(A, B);
 
     assert(C[0][0] == 2);
     assert(C[0][1] == 3);
@@ -29,7 +29,7 @@ void test_matmul_basic() {
 void test_translate_basic() {
     std::array<double, 3> pos = {3, -2, 8};
 
-    auto T = gameMatrix::translate(pos);
+    auto T = Matrix3D::gameMatrix::translate(pos);
 
     assert(T[0][3] == 3);
     assert(T[1][3] == -2);
@@ -37,7 +37,7 @@ void test_translate_basic() {
 }
 
 void test_rot3D_basic() {
-    auto R = gameMatrix::rot3D(90, 'x');
+    auto R = Matrix3D::gameMatrix::rot3D(90, 'x');
     // cos(90°) ≈ 0, sin(90°) ≈ 1
     assert(std::abs(R[1][1]) < 1e-6);
     assert(std::abs(R[1][2] + 1.0) < 1e-6);