diff --git a/PDB/src/CGALPDB/Chain.cpp b/PDB/src/CGALPDB/Chain.cpp
index fb7582acb8b..132645ddc48 100644
--- a/PDB/src/CGALPDB/Chain.cpp
+++ b/PDB/src/CGALPDB/Chain.cpp
@@ -22,7 +22,7 @@
 #include <CGAL/PDB/internal/Error_logger.h>
 #include <CGAL/PDB/internal/pdb_utils.h>
 #include <sstream>
-#include <stdio.h>
+#include <cstdio>
 
 CGAL_PDB_BEGIN_NAMESPACE
 //Residue dummy_residue;
@@ -38,7 +38,7 @@ void Chain::write_pdb(std::ostream &out) const {
 
   char line[81];
   
-  sprintf(line, "MODEL %8d         ", 1);
+  std::sprintf(line, "MODEL %8d         ", 1);
   out << line << std::endl;
   
   //    int anum=1;
@@ -71,7 +71,7 @@ int Chain::write(char chain, int start_index, std::ostream &out) const {
   }
   const char *terformat="TER   %5d      %3s %c %3d%c";
   if (!residues_.empty()) {
-    sprintf(line, terformat, start_index, 
+    std::sprintf(line, terformat, start_index, 
 	    Monomer::type_string(last_type).c_str(), chain, 
 	    last_resindex.index(),' ');
     out << line << std::endl;
diff --git a/PDB/src/CGALPDB/Heterogen.cpp b/PDB/src/CGALPDB/Heterogen.cpp
index ce42cf8ef95..7f2253e3592 100644
--- a/PDB/src/CGALPDB/Heterogen.cpp
+++ b/PDB/src/CGALPDB/Heterogen.cpp
@@ -24,7 +24,7 @@
 #include <limits>
 
 #include <sstream>
-#include <stdio.h>
+#include <cstdio>
 CGAL_PDB_BEGIN_NAMESPACE
 
 
@@ -94,11 +94,11 @@ int Heterogen::write(std::string name, int num,
     //char chain=' ';
 
     //"HETATM%5d %4s %3s  %4d    %8.3f%8.3f%8.3f%6.2f%6.2f      %4s%2s%2s";
-    sprintf(line, CGAL_PDB_INTERNAL_NS::hetatom_line_oformat_,
-	    start_index++, al.c_str(),
-	    name.c_str(), num,
-	    pt.x(), pt.y(), pt.z(), a.occupancy(), a.temperature_factor(),
-	    a.element().c_str(), "  ");
+    std::sprintf(line, CGAL_PDB_INTERNAL_NS::hetatom_line_oformat_,
+                 start_index++, al.c_str(),
+                 name.c_str(), num,
+                 pt.x(), pt.y(), pt.z(), a.occupancy(), a.temperature_factor(),
+                 a.element().c_str(), "  ");
     out << line << std::endl;
     //++anum;
   }
diff --git a/PDB/src/CGALPDB/PDB.cpp b/PDB/src/CGALPDB/PDB.cpp
index e3a61e30c92..b4a23a13324 100644
--- a/PDB/src/CGALPDB/PDB.cpp
+++ b/PDB/src/CGALPDB/PDB.cpp
@@ -23,6 +23,8 @@
 #include <cassert>
 #include <CGAL/PDB/internal/Error_logger.h>
 #include <cctype>
+#include <cstdio>
+
 CGAL_PDB_BEGIN_NAMESPACE
 
 PDB::PDB(std::istream &in, bool print_errors) {
@@ -63,9 +65,9 @@ void PDB::load(std::istream &in, bool print_errors){
       header_.push_back(std::string(line));
       int ti;
       char chain;
-      if (sscanf(line, "COMPND %d CHAIN: %c", &ti, &chain) == 2) {
+      if (std::sscanf(line, "COMPND %d CHAIN: %c", &ti, &chain) == 2) {
 	names[chain]=last_name;
-      } else if (sscanf(line, "COMPND %d MOLECULE:", &ti) ==1) {
+      } else if (std::sscanf(line, "COMPND %d MOLECULE:", &ti) ==1) {
 	int len= std::strlen(line);
 	CGAL_assertion(line[len]=='\0');
 	--len;
@@ -89,7 +91,7 @@ void PDB::load(std::istream &in, bool print_errors){
     } else if (lt== CGAL_PDB_INTERNAL_NS::MODEL) {
       int mnum=0;
       char buf[81];
-      sscanf(line, "%s %d", buf, &mnum);
+      std::sscanf(line, "%s %d", buf, &mnum);
       //new_model(Model_key(mnum), Model());
       cur_model= Model_key(mnum);
     } else if (  lt== CGAL_PDB_INTERNAL_NS::HETATM