diff --git a/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.cc b/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.cc
index cc18f2b032ee0..894cf771bb4e0 100644
--- a/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.cc
+++ b/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.cc
@@ -3,6 +3,7 @@
 #include <algorithm>
 #include <queue>
 #include <cfloat>
+#include "DataFormats/Math/interface/deltaPhi.h"
 #include "CommonTools/Utils/interface/DynArray.h"
 #include "FWCore/MessageLogger/interface/MessageLogger.h"
 
@@ -155,8 +156,8 @@ void LocalMaximumSeedFinder::findSeeds(const edm::Handle<reco::PFRecHitCollectio
             auto const& nei = (*input)[neighbour];
             if (maybeseed.depth() != nei.depth())
               continue;  // masking is done only if the neighbor is on the same depth layer as the seed
-            if ((abs(deltaPhi(maybeseed.positionREP().phi(), nei.positionREP().phi())) > dphicut) &&
-                (abs(maybeseed.positionREP().eta() - nei.positionREP().eta()) > detacut))
+            if (std::abs(deltaPhi(maybeseed.positionREP().phi(), nei.positionREP().phi())) > dphicut &&
+                std::abs(maybeseed.positionREP().eta() - nei.positionREP().eta()) > detacut)
               continue;  // masking is done only if the neighbor is on the swiss-cross w.r.t. the seed
             break;
         }
diff --git a/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.h b/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.h
index 8847d5f75dd87..e2fa5124b6543 100644
--- a/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.h
+++ b/RecoParticleFlow/PFClusterProducer/plugins/LocalMaximumSeedFinder.h
@@ -1,7 +1,6 @@
 #ifndef __LocalMaximumSeedFinder_H__
 #define __LocalMaximumSeedFinder_H__
 
-#include "DataFormats/Math/interface/deltaPhi.h"
 #include "RecoParticleFlow/PFClusterProducer/interface/SeedFinderBase.h"
 
 #include <unordered_map>