diff --git a/lib/config/applyrule.cpp b/lib/config/applyrule.cpp
index 5cfbf9e35..86aed4a70 100644
--- a/lib/config/applyrule.cpp
+++ b/lib/config/applyrule.cpp
@@ -37,11 +37,6 @@ String ApplyRule::GetPackage() const
 	return m_Package;
 }
 
-String ApplyRule::GetFKVar() const
-{
-	return m_FKVar;
-}
-
 String ApplyRule::GetFVVar() const
 {
 	return m_FVVar;
diff --git a/lib/config/applyrule.hpp b/lib/config/applyrule.hpp
index 6b6fca8f8..2e3f1d3f8 100644
--- a/lib/config/applyrule.hpp
+++ b/lib/config/applyrule.hpp
@@ -55,7 +55,12 @@ public:
 	Expression::Ptr GetExpression() const;
 	Expression::Ptr GetFilter() const;
 	String GetPackage() const;
-	String GetFKVar() const;
+
+	inline const String& GetFKVar() const noexcept
+	{
+		return m_FKVar;
+	}
+
 	String GetFVVar() const;
 	Expression::Ptr GetFTerm() const;
 	bool GetIgnoreOnError() const;