diff --git a/tests/test-encode-decode-interest.cpp b/tests/test-encode-decode-interest.cpp
index ecabda5..9281569 100644
--- a/tests/test-encode-decode-interest.cpp
+++ b/tests/test-encode-decode-interest.cpp
@@ -12,7 +12,7 @@
 using namespace std;
 using namespace ndn;
 
-unsigned char Interest1[] = {
+uint8_t Interest1[] = {
 0x01, 0xd2,
   0xf2, 0xfa, 0x9d, 0x6e, 0x64, 0x6e, 0x00, 0xfa, 0x9d, 0x61, 0x62, 0x63, 0x00, 0x00, 
   0x05, 0x9a, 0x9e, 0x31, 0x32, 0x33, 0x00,