diff --git a/test/mip_tap_test.c b/test/mip_tap_test.c
index 1b62b322..c54682af 100644
--- a/test/mip_tap_test.c
+++ b/test/mip_tap_test.c
@@ -65,15 +65,20 @@ static char *host_ip;
 
 static int s_num_tests = 0;
 
-#define ABORT()                                 \
-  usleep(500000); /* 500 ms, GH print reason */ \
+#ifdef NO_SLEEP_ABORT
+#define ABORT() abort()
+#else
+#define ABORT()                       \
+  sleep(2); /* 2s, GH print reason */ \
   abort();
+#endif
 
 #define ASSERT(expr)                                            \
   do {                                                          \
     s_num_tests++;                                              \
     if (!(expr)) {                                              \
       printf("FAILURE %s:%d: %s\n", __FILE__, __LINE__, #expr); \
+      fflush(stdout);                                           \
       ABORT();                                                  \
     }                                                           \
   } while (0)
diff --git a/test/mip_test.c b/test/mip_test.c
index 32ca2d77..5acae37b 100644
--- a/test/mip_test.c
+++ b/test/mip_test.c
@@ -21,6 +21,7 @@ static int s_seg_sent = 0;
     s_num_tests++;                                              \
     if (!(expr)) {                                              \
       printf("FAILURE %s:%d: %s\n", __FILE__, __LINE__, #expr); \
+      fflush(stdout);                                           \
       ABORT();                                                  \
     }                                                           \
   } while (0)
diff --git a/test/unit_test.c b/test/unit_test.c
index 296e735d..895d6bc5 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -18,6 +18,7 @@ static int s_num_tests = 0;
     s_num_tests++;                                              \
     if (!(expr)) {                                              \
       printf("FAILURE %s:%d: %s\n", __FILE__, __LINE__, #expr); \
+      fflush(stdout);                                           \
       ABORT();                                                  \
     }                                                           \
   } while (0)