diff --git a/LEGO1/realtime/vector4d.inl.h b/LEGO1/realtime/vector4d.inl.h
index c26ecf4678..f4c2ace0ab 100644
--- a/LEGO1/realtime/vector4d.inl.h
+++ b/LEGO1/realtime/vector4d.inl.h
@@ -75,9 +75,9 @@ void Vector4::EqualsImpl(const float* p_data)
 void Vector4::SetMatrixProduct(const float* p_vec, const float* p_mat)
 {
 	m_data[0] = p_vec[0] * p_mat[0] + p_vec[1] * p_mat[4] + p_vec[2] * p_mat[8] + p_vec[3] * p_mat[12];
-	m_data[1] = p_vec[0] * p_mat[1] + p_vec[1] * p_mat[5] + p_vec[2] * p_mat[9] + p_vec[4] * p_mat[13];
-	m_data[2] = p_vec[0] * p_mat[2] + p_vec[1] * p_mat[6] + p_vec[2] * p_mat[10] + p_vec[4] * p_mat[14];
-	m_data[3] = p_vec[0] * p_mat[3] + p_vec[1] * p_mat[7] + p_vec[2] * p_mat[11] + p_vec[4] * p_mat[15];
+	m_data[1] = p_vec[0] * p_mat[1] + p_vec[1] * p_mat[5] + p_vec[2] * p_mat[9] + p_vec[3] * p_mat[13];
+	m_data[2] = p_vec[0] * p_mat[2] + p_vec[1] * p_mat[6] + p_vec[2] * p_mat[10] + p_vec[3] * p_mat[14];
+	m_data[3] = p_vec[0] * p_mat[3] + p_vec[1] * p_mat[7] + p_vec[2] * p_mat[11] + p_vec[3] * p_mat[15];
 }
 
 // FUNCTION: LEGO1 0x10002ae0