diff --git a/adm_local/unix/config_files/check_NETGEN.m4 b/adm_local/unix/config_files/check_NETGEN.m4
index ab86d8e..c33735f 100644
--- a/adm_local/unix/config_files/check_NETGEN.m4
+++ b/adm_local/unix/config_files/check_NETGEN.m4
@@ -104,8 +104,8 @@ if test "x$NETGEN_HOME" != "x"; then
     LDFLAGS_old="$LDFLAGS"
     LDFLAGS="-L. -lNETGEN $CAS_LDPATH -lTKBRep -lTKShHealing -lTKSTEP -lTKXSBase -lTKIGES -lTKSTL -lTKTopAlgo $LDFLAGS"
 
-    AC_TRY_COMPILE(#include <iostream.h>
-#include <fstream.h>
+    AC_TRY_COMPILE(#include <iostream>
+#include <fstream>
 namespace nglib {
 #include "nglib.h"
 }
@@ -129,8 +129,8 @@ namespace nglib {
 
     AC_CACHE_VAL(salome_netgen_lib,[
                  AC_TRY_LINK(
-#include <iostream.h>
-#include <fstream.h>
+#include <iostream>
+#include <fstream>
 namespace nglib {
 #include "nglib.h"
 }