diff --git a/unit-test/Makefile b/unit-test/Makefile
index 008447f..bf1c456 100644
--- a/unit-test/Makefile
+++ b/unit-test/Makefile
@@ -35,7 +35,7 @@ $(PROJECT) : $(OBJS) $(MODULE)
 	@echo "+--------------------------------------------+"
 
 clean:
-	rm -rf *.o *.a *_unittest ../crc/*.o
+	rm -rf *.o *.a *_unittest ../crc/*.o ut/test_harness.o
 
 install :
 	test -d ../test || mkdir -p ../test
diff --git a/unit-test/crc_test.cpp b/unit-test/crc_test.cpp
index 288d65c..2482001 100644
--- a/unit-test/crc_test.cpp
+++ b/unit-test/crc_test.cpp
@@ -12,6 +12,7 @@
 #include "../crc/crc64.h"
 #include "../crc/crc_poly.h"
 #include <iostream>
+#include <string.h>
 
 TEST(CRC8Test, BasicTest)
 {
diff --git a/unit-test/ut/test_harness.o b/unit-test/ut/test_harness.o
deleted file mode 100644
index f7c2fdb..0000000
Binary files a/unit-test/ut/test_harness.o and /dev/null differ