diff --git a/tudatpy/CMakeLists.txt b/tudatpy/CMakeLists.txt
index 8e080da1..7ec2e4f1 100644
--- a/tudatpy/CMakeLists.txt
+++ b/tudatpy/CMakeLists.txt
@@ -93,11 +93,11 @@ YACMA_PYTHON_MODULE(kernel
 
         kernel/expose_numerical_simulation/expose_propagation.cpp
         kernel/expose_numerical_simulation/expose_environment.cpp
-        kernel/expose_numerical_simulation/expose_estimation.cpp
+        
         kernel/expose_numerical_simulation/expose_observation_collection.cpp
         kernel/expose_numerical_simulation/expose_single_observation_set.cpp
         kernel/expose_numerical_simulation/expose_propagated_covariance.cpp
-
+        kernel/expose_numerical_simulation/expose_estimation.cpp
         kernel/expose_numerical_simulation/expose_environment_setup.cpp
         kernel/expose_numerical_simulation/expose_environment_setup/expose_aerodynamic_coefficient_setup.cpp
         kernel/expose_numerical_simulation/expose_environment_setup/expose_atmosphere_setup.cpp