diff --git a/src/CMakeData-singletons.cmake b/src/CMakeData-singletons.cmake
index 3656929793..d61bdcf044 100644
--- a/src/CMakeData-singletons.cmake
+++ b/src/CMakeData-singletons.cmake
@@ -4,6 +4,7 @@ list(APPEND SMDATA_GLOBAL_SINGLETON_SRC
   "CharacterManager.cpp"
   "CommandLineActions.cpp"
   "CryptManager.cpp"
+  "FilterManager.cpp"
   "FontManager.cpp"
   "GameManager.cpp"
   "GameSoundManager.cpp"
@@ -31,6 +32,7 @@ list(APPEND SMDATA_GLOBAL_SINGLETON_HPP
   "CharacterManager.h"
   "CommandLineActions.h"
   "CryptManager.h"
+  "FilterManager.h"
   "FontManager.h"
   "GameManager.h"
   "GameSoundManager.h"
diff --git a/src/FilterManager.h b/src/FilterManager.h
index 894fc61d6d..0ca42139d4 100644
--- a/src/FilterManager.h
+++ b/src/FilterManager.h
@@ -19,7 +19,6 @@ class FilterManager {
 	void SetSSFilter(float v, Skillset ss, int bound);
 	void ResetSSFilters(); // reset button for filters
 	bool HighestSkillsetsOnly = false;
-	bool SkillsetFiltersActive = false; // appears to be unused
 	bool AnyActiveFilter();
 
 	//Lua