diff --git a/src/environment/global/moon_rotation.cpp b/src/environment/global/moon_rotation.cpp
index 1314de4f7..1b8aea98d 100644
--- a/src/environment/global/moon_rotation.cpp
+++ b/src/environment/global/moon_rotation.cpp
@@ -19,7 +19,7 @@ void MoonRotation::Update(const SimulationTime& simulation_time) {
   if (mode_ == MoonRotationMode::kSimple) {
     math::Vector<3> moon_position_eci_m = celestial_information_.GetPositionFromSelectedBody_i_m("MOON", "EARTH");
     math::Vector<3> moon_velocity_eci_m_s = celestial_information_.GetVelocityFromSelectedBody_i_m_s("MOON", "EARTH");
-    dcm_j2000_to_mcmf_ = CalcDcmEciToPrincipalAxis(moon_position_eci_m, moon_velocity_eci_m_s);
+    dcm_j2000_to_mcmf_ = planet_rotation::CalcDcmEciToPrincipalAxis(moon_position_eci_m, moon_velocity_eci_m_s);
   } else if (mode_ == MoonRotationMode::kIauMoon) {
     ConstSpiceChar from[] = "J2000";
     ConstSpiceChar to[] = "IAU_MOON";
diff --git a/src/math_physics/planet_rotation/moon_rotation_utilities.cpp b/src/math_physics/planet_rotation/moon_rotation_utilities.cpp
index 93a3ee2e5..cd6dc020a 100644
--- a/src/math_physics/planet_rotation/moon_rotation_utilities.cpp
+++ b/src/math_physics/planet_rotation/moon_rotation_utilities.cpp
@@ -10,6 +10,8 @@
 
 #include <math_physics/math/constants.hpp>
 
+namespace planet_rotation {
+
 math::Matrix<3, 3> CalcDcmEciToPrincipalAxis(const math::Vector<3> moon_position_eci_m, const math::Vector<3> moon_velocity_eci_m_s) {
   math::Matrix<3, 3> dcm_eci2me = CalcDcmEciToMeanEarth(moon_position_eci_m, moon_velocity_eci_m_s);
   math::Matrix<3, 3> dcm_me2pa = CalcDcmMeanEarthToPrincipalAxis();
@@ -46,3 +48,5 @@ math::Matrix<3, 3> CalcDcmMeanEarthToPrincipalAxis() {
 
   return dcm_me_pa;
 }
+
+}  // namespace planet_rotation
diff --git a/src/math_physics/planet_rotation/moon_rotation_utilities.hpp b/src/math_physics/planet_rotation/moon_rotation_utilities.hpp
index e2726f5e4..9ce97f876 100644
--- a/src/math_physics/planet_rotation/moon_rotation_utilities.hpp
+++ b/src/math_physics/planet_rotation/moon_rotation_utilities.hpp
@@ -12,6 +12,8 @@
 #include "math_physics/math/matrix.hpp"
 #include "math_physics/math/vector.hpp"
 
+namespace planet_rotation {
+
 /**
  * @fn CalcDcmEciToPrincipalAxis
  * @brief Calculate DCM from ECI to PA (Principal Axis) moon fixed frame
@@ -34,4 +36,6 @@ math::Matrix<3, 3> CalcDcmEciToMeanEarth(const math::Vector<3> moon_position_eci
  */
 math::Matrix<3, 3> CalcDcmMeanEarthToPrincipalAxis();
 
+}  // namespace planet_rotation
+
 #endif  // S2E_LIBRARY_PLANET_ROTATION_MOON_MEAN_EARTH_PRINCIPAL_AXIS_FRAME_HPP_