diff --git a/src/FDM/JSBSim/CMakeLists.txt b/src/FDM/JSBSim/CMakeLists.txt
index 32698ebba..9f6080f12 100644
--- a/src/FDM/JSBSim/CMakeLists.txt
+++ b/src/FDM/JSBSim/CMakeLists.txt
@@ -7,9 +7,6 @@ set(HEADERS
     initialization/FGInitialCondition.h
     initialization/FGTrim.h
     initialization/FGTrimAxis.h
-    initialization/FGSimplexTrim.h
-    initialization/FGTrimmer.h
-    initialization/FGLinearization.h
     input_output/FGXMLParse.h
     input_output/FGXMLFileRead.h
     input_output/FGPropertyReader.h
@@ -109,9 +106,6 @@ set(SOURCES
     initialization/FGInitialCondition.cpp
     initialization/FGTrim.cpp
     initialization/FGTrimAxis.cpp
-    initialization/FGSimplexTrim.cpp
-    initialization/FGTrimmer.cpp
-    initialization/FGLinearization.cpp
     input_output/FGGroundCallback.cpp
     input_output/FGPropertyReader.cpp
     input_output/FGPropertyManager.cpp