diff --git a/ndn-cpp/util/ndn_memory.c b/ndn-cpp/util/ndn_memory.c
index 5863d44..8699309 100644
--- a/ndn-cpp/util/ndn_memory.c
+++ b/ndn-cpp/util/ndn_memory.c
@@ -14,6 +14,8 @@
   for (i = 0; i < len; i++)
     dest[i] = src[i];
 }
+#else
+int ndn_memcpy_stub_to_avoid_empty_file_warning = 0;
 #endif
 
 #if !HAVE_MEMSET
@@ -24,4 +26,6 @@
   for (i = 0; i < len; i++)
     dest[i] = (unsigned char)val;
 }
+#else
+int ndn_memset_stub_to_avoid_empty_file_warning = 0;
 #endif
\ No newline at end of file