diff --git a/docs/05.PORT-API.md b/docs/05.PORT-API.md
index 759af10f3..bfdab9e13 100644
--- a/docs/05.PORT-API.md
+++ b/docs/05.PORT-API.md
@@ -25,8 +25,8 @@ Error codes
 typedef enum
 {
   ERR_OUT_OF_MEMORY = 10,
-  ERR_SYSCALL = 11,
   ERR_REF_COUNT_LIMIT = 12,
+  ERR_DISABLED_BYTE_CODE = 13,
   ERR_FAILED_INTERNAL_ASSERTION = 120
 } jerry_fatal_code_t;
 ```
diff --git a/jerry-core/include/jerryscript-port.h b/jerry-core/include/jerryscript-port.h
index cc6eca8ce..f79efed0b 100644
--- a/jerry-core/include/jerryscript-port.h
+++ b/jerry-core/include/jerryscript-port.h
@@ -48,7 +48,6 @@ extern "C"
 typedef enum
 {
   ERR_OUT_OF_MEMORY = 10,
-  ERR_SYSCALL = 11,
   ERR_REF_COUNT_LIMIT = 12,
   ERR_DISABLED_BYTE_CODE = 13,
   ERR_FAILED_INTERNAL_ASSERTION = 120
diff --git a/jerry-core/jrt/jrt-fatals.c b/jerry-core/jrt/jrt-fatals.c
index 838cbc925..8421981f1 100644
--- a/jerry-core/jrt/jrt-fatals.c
+++ b/jerry-core/jrt/jrt-fatals.c
@@ -37,11 +37,6 @@ jerry_fatal (jerry_fatal_code_t code) /**< status code */
       JERRY_ERROR_MSG ("Error: ERR_OUT_OF_MEMORY\n");
       break;
     }
-    case ERR_SYSCALL:
-    {
-      /* print nothing as it may invoke syscall recursively */
-      break;
-    }
     case ERR_REF_COUNT_LIMIT:
     {
       JERRY_ERROR_MSG ("Error: ERR_REF_COUNT_LIMIT\n");
diff --git a/jerry-core/vm/vm.c b/jerry-core/vm/vm.c
index 16468b3a9..dc137191e 100644
--- a/jerry-core/vm/vm.c
+++ b/jerry-core/vm/vm.c
@@ -3112,7 +3112,6 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
           JERRY_ASSERT (VM_OC_GROUP_GET_INDEX (opcode_data) == VM_OC_NONE);
 
           jerry_fatal (ERR_DISABLED_BYTE_CODE);
-          JERRY_UNREACHABLE ();
         }
       }