diff --git a/src/units/filter.cpp b/src/units/filter.cpp
index e96ad007d61..de40708ee04 100644
--- a/src/units/filter.cpp
+++ b/src/units/filter.cpp
@@ -35,6 +35,8 @@
 #include "units/types.hpp"
 #include "variable.hpp" // needed for vconfig, scoped unit
 #include "wml_exception.hpp" // needed for FAIL
+#include "formula/callable_objects.hpp"
+#include "formula/formula.hpp"
 
 #include <boost/foreach.hpp>
 #include <boost/optional.hpp>
@@ -551,7 +553,16 @@ bool basic_unit_filter_impl::internal_matches_filter(const unit & u, const map_l
 		}
 	}
 	if (!vcfg["formula"].blank()) {
-		if (!u.formula_manager().matches_filter(vcfg["formula"], loc, u)) {
+		try {
+			const unit_callable callable(loc,u);
+			const game_logic::formula form(vcfg["formula"]);
+			if(!form.evaluate(callable).as_bool()) {
+				return false;
+			}
+			return true;
+		} catch(game_logic::formula_error& e) {
+			lg::wml_error() << "Formula error in unit filter: " << e.type << " at " << e.filename << ':' << e.line << ")\n";
+			// Formulae with syntax errors match nothing
 			return false;
 		}
 	}
diff --git a/src/units/formula_manager.cpp b/src/units/formula_manager.cpp
index 8a107cae011..5f62bfa306f 100644
--- a/src/units/formula_manager.cpp
+++ b/src/units/formula_manager.cpp
@@ -23,22 +23,6 @@
 
 #include <boost/foreach.hpp>
 
-bool unit_formula_manager::matches_filter(const std::string & cfg_formula, const map_location & loc, const unit & me)
-{
-	try {
-		const unit_callable callable(loc,me);
-		const game_logic::formula form(cfg_formula);
-		if(!form.evaluate(callable).as_bool()) {///@todo use formula_ai
-			return false;
-		}
-		return true;
-	} catch(game_logic::formula_error& e) {
-		lg::wml_error() << "Formula error in unit filter: " << e.type << " at " << e.filename << ':' << e.line << ")\n";
-		// Formulae with syntax errors match nothing
-		return false;
-	}
-}
-
 void unit_formula_manager::add_formula_var(std::string str, variant var)
 {
 	if(!formula_vars_) formula_vars_ = new game_logic::map_formula_callable;
diff --git a/src/units/formula_manager.hpp b/src/units/formula_manager.hpp
index 70b80edef0a..370f3330fc3 100644
--- a/src/units/formula_manager.hpp
+++ b/src/units/formula_manager.hpp
@@ -43,8 +43,6 @@ public:
 	const std::string& get_loop_formula() const { return unit_loop_formula_; }
 	const std::string& get_priority_formula() const { return unit_priority_formula_; }
 
-	bool matches_filter( const std::string & cfg_formula, const map_location & loc, const unit & me);
-
 	void read(const config & ai);
 	void write(config & cfg);