diff --git a/source/RobotAPI/libraries/skills/provider/CMakeLists.txt b/source/RobotAPI/libraries/skills/provider/CMakeLists.txt
index e5df870817e13549d985ae816081e5e989c79ee8..5ccff912099114655eb96dd46c9e61966f677df7 100644
--- a/source/RobotAPI/libraries/skills/provider/CMakeLists.txt
+++ b/source/RobotAPI/libraries/skills/provider/CMakeLists.txt
@@ -22,6 +22,7 @@ armarx_add_library(
         SimpleSkill.cpp
         SimpleSpecializedSkill.cpp
         SkillProxy.cpp
+        SpecializedSkillProxy.cpp
         PeriodicSkill.cpp
         SpecializedSkill.cpp
         PeriodicSpecializedSkill.cpp
@@ -36,6 +37,7 @@ armarx_add_library(
         SimpleSkill.h
         SimpleSpecializedSkill.h
         SkillProxy.h
+        SpecializedSkillProxy.h
         PeriodicSkill.h
         SpecializedSkill.h
         PeriodicSpecializedSkill.h