diff --git a/configs/config.json.cluster.example b/configs/config.json.cluster.example
index c9cc3b3ca3..1bedbcbab9 100644
--- a/configs/config.json.cluster.example
+++ b/configs/config.json.cluster.example
@@ -100,6 +100,7 @@
     "reconnecting_timeout": 15,
     "catch_randomize_reticle_factor": 1.0,
     "catch_randomize_spin_factor": 1.0,
+    "min_ultraball_to_keep": 10,
     "logging_color": true,
     "catch": {
       "any": {"catch_above_cp": 0, "catch_above_iv": 0, "logic": "or"},
diff --git a/configs/config.json.example b/configs/config.json.example
index 2cf5a0f737..f306d3a920 100644
--- a/configs/config.json.example
+++ b/configs/config.json.example
@@ -113,6 +113,9 @@
     "location_cache": true,
     "distance_unit": "km",
     "reconnecting_timeout": 15,
+    "catch_randomize_reticle_factor": 1.0,
+    "catch_randomize_spin_factor": 1.0,
+    "min_ultraball_to_keep": 10,
     "logging_color": true,
     "catch": {
       "any": {"catch_above_cp": 0, "catch_above_iv": 0, "logic": "or"},
diff --git a/configs/config.json.map.example b/configs/config.json.map.example
index ff2b8a69e2..6051e063cc 100644
--- a/configs/config.json.map.example
+++ b/configs/config.json.map.example
@@ -342,6 +342,7 @@
     "reconnecting_timeout": 15,
     "catch_randomize_reticle_factor": 1.0,
     "catch_randomize_spin_factor": 1.0,
+    "min_ultraball_to_keep": 10,
     "logging_color": true,
     "catch": {
       "any": {"catch_above_cp": 0, "catch_above_iv": 0, "logic": "or"},
diff --git a/configs/config.json.path.example b/configs/config.json.path.example
index 23578f8125..2581862b31 100644
--- a/configs/config.json.path.example
+++ b/configs/config.json.path.example
@@ -102,6 +102,7 @@
     "reconnecting_timeout": 15,
     "catch_randomize_reticle_factor": 1.0,
     "catch_randomize_spin_factor": 1.0,
+    "min_ultraball_to_keep": 10,
     "logging_color": true,
     "catch": {
       "any": {"catch_above_cp": 0, "catch_above_iv": 0, "logic": "or"},
diff --git a/configs/config.json.pokemon.example b/configs/config.json.pokemon.example
index a2d5d96a2b..2ad81a7369 100644
--- a/configs/config.json.pokemon.example
+++ b/configs/config.json.pokemon.example
@@ -108,6 +108,7 @@
     "reconnecting_timeout": 15,
     "catch_randomize_reticle_factor": 1.0,
     "catch_randomize_spin_factor": 1.0,
+    "min_ultraball_to_keep": 10,
     "logging_color": true,
     "catch": {
       "any": {"catch_above_cp": 0, "catch_above_iv": 0, "logic": "or" },
diff --git a/pokecli.py b/pokecli.py
index 2cd5553ba5..4ccedb5fa6 100644
--- a/pokecli.py
+++ b/pokecli.py
@@ -454,6 +454,7 @@ def _json_loader(filename):
     config.action_wait_min = load.get('action_wait_min', 1)
     config.plugins = load.get('plugins', [])
     config.raw_tasks = load.get('tasks', [])
+    config.min_ultraball_to_keep = load.get('min_ultraball_to_keep', None)
 
     config.vips = load.get('vips', {})
 
diff --git a/pokemongo_bot/cell_workers/pokemon_catch_worker.py b/pokemongo_bot/cell_workers/pokemon_catch_worker.py
index d28f3f58fd..edd5db567e 100644
--- a/pokemongo_bot/cell_workers/pokemon_catch_worker.py
+++ b/pokemongo_bot/cell_workers/pokemon_catch_worker.py
@@ -264,6 +264,12 @@ def _do_catch(self, pokemon, encounter_id, catch_rate_by_ball, is_vip=False):
         berry_count = self.bot.item_inventory_count(berry_id)
         items_stock = self.bot.current_inventory()
 
+        # use `min_ultraball_to_keep` from config if is not None
+        min_ultraball_to_keep = items_stock[ITEM_ULTRABALL]
+        if self.config.min_ultraball_to_keep is not None:
+            if self.config.min_ultraball_to_keep >= 0 and self.config.min_ultraball_to_keep < min_ultraball_to_keep:
+                min_ultraball_to_keep = self.config.min_ultraball_to_keep
+
         while True:
 
             # find lowest available ball
@@ -272,7 +278,13 @@ def _do_catch(self, pokemon, encounter_id, catch_rate_by_ball, is_vip=False):
                 current_ball += 1
             if items_stock[current_ball] == 0:
                 self.emit_event('no_pokeballs', formatted='No usable pokeballs found!')
-                break
+
+                # use untraball if there is no other balls with constraint to `min_ultraball_to_keep`
+                if maximum_ball != ITEM_ULTRABALL and items_stock[ITEM_ULTRABALL] > min_ultraball_to_keep:
+                    maximum_ball = ITEM_ULTRABALL
+                    continue
+                else:
+                    break
 
             # check future ball count
             num_next_balls = 0