diff --git a/ndn-cpp/c/util/time.c b/ndn-cpp/c/util/time.c
index 314eead..4c3be3a 100644
--- a/ndn-cpp/c/util/time.c
+++ b/ndn-cpp/c/util/time.c
@@ -4,8 +4,13 @@
  * See COPYING for copyright and distribution information.
  */
 
+#include <ndn-cpp/ndn-cpp-config.h>
+#if NDN_CPP_HAVE_TIME_H
 #include <time.h>
+#endif
+#if NDN_CPP_HAVE_SYS_TIME_H
 #include <sys/time.h>
+#endif
 #include <math.h>
 #include <string.h>
 #include <stdio.h>