diff --git a/app/Http/Controllers/Api/Expenses/Bills.php b/app/Http/Controllers/Api/Expenses/Bills.php
index 5280457c7..ba7d4b2cc 100644
--- a/app/Http/Controllers/Api/Expenses/Bills.php
+++ b/app/Http/Controllers/Api/Expenses/Bills.php
@@ -70,7 +70,7 @@ class Bills extends ApiController
                     $item_sku = $item_object->sku;
 
                     // Increase stock (item bought)
-                    $item_object->quantity++;
+                    $item_object->quantity += $item['quantity'];
                     $item_object->save();
                 } elseif (!empty($item['sku'])) {
                     $item_sku = $item['sku'];
diff --git a/app/Http/Controllers/Api/Incomes/Invoices.php b/app/Http/Controllers/Api/Incomes/Invoices.php
index 859bfb305..a30dcfea5 100644
--- a/app/Http/Controllers/Api/Incomes/Invoices.php
+++ b/app/Http/Controllers/Api/Incomes/Invoices.php
@@ -79,7 +79,7 @@ class Invoices extends ApiController
                     $item_sku = $item_object->sku;
 
                     // Decrease stock (item sold)
-                    $item_object->quantity--;
+                    $item_object->quantity -= $item['quantity'];
                     $item_object->save();
 
                     // Notify users if out of stock
diff --git a/app/Http/Controllers/Expenses/Bills.php b/app/Http/Controllers/Expenses/Bills.php
index b299daab1..884e6bb8e 100644
--- a/app/Http/Controllers/Expenses/Bills.php
+++ b/app/Http/Controllers/Expenses/Bills.php
@@ -156,7 +156,7 @@ class Bills extends Controller
                     $item_sku = $item_object->sku;
 
                     // Increase stock (item bought)
-                    $item_object->quantity++;
+                    $item_object->quantity += $item['quantity'];
                     $item_object->save();
                 }
 
diff --git a/app/Http/Controllers/Incomes/Invoices.php b/app/Http/Controllers/Incomes/Invoices.php
index 37c77e083..9ebfd7e92 100644
--- a/app/Http/Controllers/Incomes/Invoices.php
+++ b/app/Http/Controllers/Incomes/Invoices.php
@@ -162,7 +162,7 @@ class Invoices extends Controller
                     $item_sku = $item_object->sku;
 
                     // Decrease stock (item sold)
-                    $item_object->quantity--;
+                    $item_object->quantity -= $item['quantity'];
                     $item_object->save();
 
                     // Notify users if out of stock