diff --git a/DataFormats/SiStripCluster/src/SiStripApproximateCluster.cc b/DataFormats/SiStripCluster/src/SiStripApproximateCluster.cc
index d5e601e4ab1..1ad0512f7c5 100644
--- a/DataFormats/SiStripCluster/src/SiStripApproximateCluster.cc
+++ b/DataFormats/SiStripCluster/src/SiStripApproximateCluster.cc
@@ -1,8 +1,8 @@
 #include "DataFormats/SiStripCluster/interface/SiStripApproximateCluster.h"
 #include "DataFormats/SiStripCluster/interface/SiStripCluster.h"
 #include <algorithm>
+#include <cassert>
 #include <cmath>
-#include <assert.h>
 
 SiStripApproximateCluster::SiStripApproximateCluster(const SiStripCluster& cluster,
                                                      unsigned int maxNSat,