diff --git a/tests/test-encode-decode-data.cpp b/tests/test-encode-decode-data.cpp
index 67e2e89..744ac06 100644
--- a/tests/test-encode-decode-data.cpp
+++ b/tests/test-encode-decode-data.cpp
@@ -24,7 +24,7 @@
 using namespace func_lib::placeholders;
 #endif
 
-static unsigned char DEFAULT_PUBLIC_KEY_DER[] = {
+static uint8_t DEFAULT_PUBLIC_KEY_DER[] = {
 0x30, 0x81, 0x9F, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81,
 0x8D, 0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00, 0xE1, 0x7D, 0x30, 0xA7, 0xD8, 0x28, 0xAB, 0x1B, 0x84, 0x0B, 0x17,
 0x54, 0x2D, 0xCA, 0xF6, 0x20, 0x7A, 0xFD, 0x22, 0x1E, 0x08, 0x6B, 0x2A, 0x60, 0xD1, 0x6C, 0xB7, 0xF5, 0x44, 0x48, 0xBA,
@@ -36,7 +36,7 @@
 0x00, 01  
 };
 
-static unsigned char DEFAULT_PRIVATE_KEY_DER[] = {
+static uint8_t DEFAULT_PRIVATE_KEY_DER[] = {
 0x30, 0x82, 0x02, 0x5d, 0x02, 0x01, 0x00, 0x02, 0x81, 0x81, 0x00, 0xe1, 0x7d, 0x30, 0xa7, 0xd8, 0x28, 0xab, 0x1b, 0x84,
 0x0b, 0x17, 0x54, 0x2d, 0xca, 0xf6, 0x20, 0x7a, 0xfd, 0x22, 0x1e, 0x08, 0x6b, 0x2a, 0x60, 0xd1, 0x6c, 0xb7, 0xf5, 0x44,
 0x48, 0xba, 0x9f, 0x3f, 0x08, 0xbc, 0xd0, 0x99, 0xdb, 0x21, 0xdd, 0x16, 0x2a, 0x77, 0x9e, 0x61, 0xaa, 0x89, 0xee, 0xe5,
@@ -70,7 +70,7 @@
 0x30, 0x18, 0xeb, 0x90, 0xfb, 0x17, 0xd3, 0xce, 0xb5
 };
 
-unsigned char Data1[] = {
+uint8_t Data1[] = {
 0x04, 0x82, // NDN Data
   0x02, 0xaa, // Signature
     0x03, 0xb2, // SignatureBits
@@ -233,7 +233,7 @@
     dumpData(*reDecodedData);
   
     shared_ptr<Data> freshData(new Data(Name("/ndn/abc")));
-    const unsigned char freshContent[] = "SUCCESS!";
+    const uint8_t freshContent[] = "SUCCESS!";
     freshData->setContent(freshContent, sizeof(freshContent) - 1);
     freshData->getMetaInfo().setTimestampMilliseconds(time(NULL) * 1000.0);