diff --git a/jerry-core/debugger/debugger.c b/jerry-core/debugger/debugger.c
index aa4a309d69021f77e679e66fb02667d2385f72f5..5ab1512f899d585c4c656be67abace0b34663c28 100644
--- a/jerry-core/debugger/debugger.c
+++ b/jerry-core/debugger/debugger.c
@@ -24,6 +24,9 @@
 #include "jcontext.h"
 #include "jerryscript-port.h"
 #include "lit-char-helpers.h"
+#if defined (__APPLE__)
+#include <time.h>
+#endif
 
 #if ENABLED (JERRY_DEBUGGER)
 
@@ -1165,6 +1168,11 @@ jerry_debugger_receive (jerry_debugger_uint8_data_t **message_data_p) /**< [out]
 
   while (true)
   {
+#if defined (__APPLE__)
+    // wait at here for 0.5ms
+    usleep(500)
+#endif /* __APPLE__ */
+
     jerry_debugger_transport_receive_context_t context;
     if (!jerry_debugger_transport_receive (&context))
     {
diff --git a/jerry-port/default/default-io.c b/jerry-port/default/default-io.c
index 0788ae699527485bd6af16e40db5f33b5307bda2..a009ae4be7f6be1cc68e818982e413087e32f474 100644
--- a/jerry-port/default/default-io.c
+++ b/jerry-port/default/default-io.c
@@ -94,7 +94,7 @@ jerry_port_log (jerry_log_level_t level, /**< message log level */
       JERRY_VLA (char, buffer, length + 1);
       vsnprintf (buffer, (size_t) length + 1, format, args);
 
-      fprintf (stderr, "%s", buffer);
+      fprintf (stderr, "[JERRYSCRIPT]%s", buffer);
       jerry_debugger_send_log (level, (jerry_char_t *) buffer, (jerry_size_t) length);
     }
     else