diff --git a/RecoTracker/LSTCore/interface/LSTPrepareInput.h b/RecoTracker/LSTCore/interface/LSTPrepareInput.h
index 66c9ddd77f5..5f575e644a5 100644
--- a/RecoTracker/LSTCore/interface/LSTPrepareInput.h
+++ b/RecoTracker/LSTCore/interface/LSTPrepareInput.h
@@ -10,7 +10,7 @@
 
 namespace lst {
 
-  ROOT::Math::XYZVector calculateR3FromPCA(const ROOT::Math::XYZVector& p3, float dxy, float dz) {
+  inline ROOT::Math::XYZVector calculateR3FromPCA(const ROOT::Math::XYZVector& p3, float dxy, float dz) {
     const float pt = p3.rho();
     const float p = p3.r();
     const float vz = dz * pt * pt / p / p;
@@ -20,7 +20,7 @@ namespace lst {
     return {vx, vy, vz};
   }
 
-  LSTInputHostCollection prepareInput(std::vector<float> const& see_px,
+  inline LSTInputHostCollection prepareInput(std::vector<float> const& see_px,
                                       std::vector<float> const& see_py,
                                       std::vector<float> const& see_pz,
                                       std::vector<float> const& see_dxy,
@@ -92,7 +92,7 @@ namespace lst {
 
     for (size_t iSeed = 0; iSeed < n_see; iSeed++) {
       // Only needed for standalone
-      bool good_seed_type = see_algo.size() == 0 || see_algo[iSeed] == 4 || see_algo[iSeed] == 22;
+      bool good_seed_type = see_algo.empty() || see_algo[iSeed] == 4 || see_algo[iSeed] == 22;
       if (!good_seed_type)
         continue;