diff --git a/src/MyFirstUDRKit.cpp b/src/MyFirstUDRKit.cpp
index 72a8686..010e446 100644
--- a/src/MyFirstUDRKit.cpp
+++ b/src/MyFirstUDRKit.cpp
@@ -31,8 +31,8 @@
 #include <firebird/UdrCppEngine.h>
 
 #include <cassert>
-#include <stdio.h>
-#include <stdlib.h>
+#include <cstdio>
+#include <cstdlib>
 
 #ifdef HAVE_MATH_H
 #include <math.h>
@@ -49,7 +49,7 @@
 # ifdef HAVE_SYS_TIME_H
 #  include <sys/time.h>
 # else
-#  include <time.h>
+#  include <ctime>
 # endif
 #endif
 
diff --git a/src/MyFirstUDRKit.h b/src/MyFirstUDRKit.h
index 7a598ed..3ae3f8a 100644
--- a/src/MyFirstUDRKit.h
+++ b/src/MyFirstUDRKit.h
@@ -8,8 +8,8 @@
 
 #include "ibase.h"
 #include "firebird/UdrCppEngine.h"
-#include <assert.h>
-#include <stdio.h>
+#include <cassert>
+#include <cstdio>