diff --git a/testsuites/unittest/extended/trace/smoke/trace_test_004.cpp b/testsuites/unittest/extended/trace/smoke/trace_test_004.cpp
index 513624cc28ce206170f1b6b0dc6ffc52aeedf990..8429ed3631f20710e931b03b4883840c683f2c25 100644
--- a/testsuites/unittest/extended/trace/smoke/trace_test_004.cpp
+++ b/testsuites/unittest/extended/trace/smoke/trace_test_004.cpp
@@ -43,7 +43,7 @@ static UINT32 TestCase(VOID)
 
     ioctl(fd, TRACE_STOP, NULL);
 
-    buffer = (char *)malloc(size);
+    buffer = static_cast<char *>(malloc(size));
     if (buffer == NULL) {
         printf("Read buffer malloc failed!\n");
         goto EXIT;
diff --git a/testsuites/unittest/libc/misc/It_test_misc.h b/testsuites/unittest/libc/misc/It_test_misc.h
index 909c1c6d6d8e8411978adafe728e83c1fa2675e3..a89fbc81199d99e0d2b3167c345beed8fb132b7b 100644
--- a/testsuites/unittest/libc/misc/It_test_misc.h
+++ b/testsuites/unittest/libc/misc/It_test_misc.h
@@ -38,7 +38,7 @@
 #include "unistd.h"
 #include "search.h"
 #define MISC_OK 0
-#define MISC_NOK -1
+#define MISC_NOK (-1)
 
 extern VOID ItTestMisc001(VOID);
 extern VOID ItTestMisc002(VOID);
diff --git a/testsuites/unittest/net/resolv/smoke/net_resolv_test_001.cpp b/testsuites/unittest/net/resolv/smoke/net_resolv_test_001.cpp
index bf981653080f25fa57fac62fc30edc86e7eda232..821c82eb0f6ab3d65e2466b8408ba98d716500ae 100644
--- a/testsuites/unittest/net/resolv/smoke/net_resolv_test_001.cpp
+++ b/testsuites/unittest/net/resolv/smoke/net_resolv_test_001.cpp
@@ -47,7 +47,7 @@ static int DnCompTest(void)
     unsigned char **lastdnptr = &dnptrs[6];
     int offset, ret;
 
-    offset = strlen(reinterpret_cast<const char *>(dnptrs[0]))+1;
+    offset = strlen(reinterpret_cast<const char *>(dnptrs[0])) + 1;
     ret = dn_comp("x.y.z.example.com", comp_dn + offset, sizeof(comp_dn) - offset, dnptrs, lastdnptr);
     dump(comp_dn + offset, ret);
     ICUNIT_ASSERT_EQUAL(ret, 19, ret);