diff --git a/liblog/tests/liblog_test.cpp b/liblog/tests/liblog_test.cpp
index d68ca46..5a52377 100644
--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -169,6 +169,9 @@
 
 TEST(liblog, __android_log_btwrite__android_logger_list_read) {
 #if (defined(__ANDROID__) || defined(USING_LOGGER_LOCAL))
+#ifdef TEST_PREFIX
+  TEST_PREFIX
+#endif
   struct logger_list* logger_list;
 
   pid_t pid = getpid();
diff --git a/logcat/tests/logcat_test.cpp b/logcat/tests/logcat_test.cpp
index 9c777b3..dad74ee 100644
--- a/logcat/tests/logcat_test.cpp
+++ b/logcat/tests/logcat_test.cpp
@@ -329,7 +329,7 @@
     do_tail(1000);
 }
 
-TEST(logcat, tail_time) {
+static void do_tail_time(const char* cmd) {
     FILE* fp;
     int count;
     char buffer[BIG_BUFFER];
@@ -343,14 +343,9 @@
     int tries = 4;  // in case run too soon after system start or buffer clear
 
     do {
+        snprintf(buffer, sizeof(buffer), "%s -t 10 2>&1", cmd);
         logcat_define(ctx);
-        ASSERT_TRUE(NULL != (fp = logcat_popen(ctx,
-                                               "logcat"
-                                               " -v long"
-                                               " -v nsec"
-                                               " -b all"
-                                               " -t 10"
-                                               " 2>&1")));
+        ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
         count = 0;
 
         while ((input = fgetLongTime(buffer, sizeof(buffer), fp))) {
@@ -372,14 +367,7 @@
     EXPECT_TRUE(first_timestamp != NULL);
     EXPECT_TRUE(second_timestamp != NULL);
 
-    snprintf(buffer, sizeof(buffer),
-             "logcat"
-             " -v long"
-             " -v nsec"
-             " -b all"
-             " -t '%s'"
-             " 2>&1",
-             first_timestamp);
+    snprintf(buffer, sizeof(buffer), "%s -t '%s' 2>&1", cmd, first_timestamp);
     logcat_define(ctx);
     ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
 
@@ -446,6 +434,14 @@
     EXPECT_LE(count, last_timestamp_count);
 }
 
+TEST(logcat, tail_time) {
+    do_tail_time("logcat -v long -v nsec -b all");
+}
+
+TEST(logcat, tail_time_epoch) {
+    do_tail_time("logcat -v long -v nsec -v epoch -b all");
+}
+
 TEST(logcat, End_to_End) {
     pid_t pid = getpid();