diff --git a/RecoTracker/MkFitCore/interface/SteeringParams.h b/RecoTracker/MkFitCore/interface/SteeringParams.h
index 2e0b8a17c3f7e..e6a1effb0c16e 100644
--- a/RecoTracker/MkFitCore/interface/SteeringParams.h
+++ b/RecoTracker/MkFitCore/interface/SteeringParams.h
@@ -1,6 +1,8 @@
 #ifndef RecoTracker_MkFitCore_interface_SteeringParams_h
 #define RecoTracker_MkFitCore_interface_SteeringParams_h
 
+#include "RecoTracker/MkFitCore/interface/FunctionTypes.h"
+
 #include <vector>
 #include <stdexcept>