diff --git a/controllers/StockApiController.php b/controllers/StockApiController.php
index 04f9e04f..beecdafe 100644
--- a/controllers/StockApiController.php
+++ b/controllers/StockApiController.php
@@ -165,4 +165,17 @@ class StockApiController extends BaseApiController
 			return $this->VoidApiActionResponse($response, false, 400, $ex->getMessage());
 		}
 	}
+
+	public function UndoBooking(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args)
+	{
+		try
+		{
+			$this->ApiResponse($this->StockService->UndoBooking($args['stockLogId']));
+			return $this->ApiResponse(array('success' => true));
+		}
+		catch (\Exception $ex)
+		{
+			return $this->VoidApiActionResponse($response, false, 400, $ex->getMessage());
+		}
+	}
 }
diff --git a/grocy.openapi.json b/grocy.openapi.json
index 133fa726..61097667 100644
--- a/grocy.openapi.json
+++ b/grocy.openapi.json
@@ -1288,6 +1288,47 @@
 				}
 			}
 		},
+		"/stock/undo-booking/{stockLogId}": {
+			"get": {
+				"description": "Undoes a booking",
+				"tags": [
+					"Stock"
+				],
+				"parameters": [
+					{
+						"in": "path",
+						"name": "stockLogId",
+						"required": true,
+						"description": "A valid stock log id",
+						"schema": {
+							"type": "integer"
+						}
+					}
+				],
+				"responses": {
+					"200": {
+						"description": "A VoidApiActionResponse object",
+						"content": {
+							"application/json": {
+								"schema": {
+									"$ref": "#/components/schemas/VoidApiActionResponse"
+								}
+							}
+						}
+					},
+					"400": {
+						"description": "A VoidApiActionResponse object (possible errors are: Not existing booking)",
+						"content": {
+							"application/json": {
+								"schema": {
+									"$ref": "#/components/schemas/ErrorExampleVoidApiActionResponse"
+								}
+							}
+						}
+					}
+				}
+			}
+		},
 		"/recipes/add-not-fulfilled-products-to-shopping-list/{recipeId}": {
 			"get": {
 				"description": "Adds all missing products for the given recipe to the shopping list",
diff --git a/migrations/0044.sql b/migrations/0044.sql
new file mode 100644
index 00000000..6f2aac90
--- /dev/null
+++ b/migrations/0044.sql
@@ -0,0 +1,5 @@
+ALTER TABLE stock_log
+ADD undone TINYINT NOT NULL DEFAULT 0 CHECK(undone IN (0, 1));
+
+ALTER TABLE stock_log
+ADD undone_timestamp DATETIME;
diff --git a/routes.php b/routes.php
index 3014f735..02964c67 100644
--- a/routes.php
+++ b/routes.php
@@ -114,6 +114,7 @@ $app->group('/api', function()
 	$this->get('/stock/add-missing-products-to-shoppinglist', '\Grocy\Controllers\StockApiController:AddMissingProductsToShoppingList');
 	$this->get('/stock/clear-shopping-list', '\Grocy\Controllers\StockApiController:ClearShoppingList');
 	$this->get('/stock/external-barcode-lookup/{barcode}', '\Grocy\Controllers\StockApiController:ExternalBarcodeLookup');
+	$this->get('/stock/undo-booking/{stockLogId}', '\Grocy\Controllers\StockApiController:UndoBooking');
 
 	// Recipes
 	$this->get('/recipes/add-not-fulfilled-products-to-shopping-list/{recipeId}', '\Grocy\Controllers\RecipesApiController:AddNotFulfilledProductsToShoppingList');
diff --git a/services/StockService.php b/services/StockService.php
index 9cf0c95d..1f421100 100644
--- a/services/StockService.php
+++ b/services/StockService.php
@@ -305,4 +305,52 @@ class StockService extends BaseService
 
 		return $pluginOutput;
 	}
+
+	public function UndoBooking($stockLogId)
+	{
+		//TODO: This is not possible when the given booking has subsequent bookings
+
+		$logRow = $this->Database->stock_log()->where('id = :1', $stockLogId)->fetch();
+
+		if ($logRow == null)
+		{
+			throw new \Exception('Booking does not exist');
+		}
+
+		if ($logRow->transaction_type === self::TRANSACTION_TYPE_PURCHASE)
+		{
+			// Remove corresponding stock entry
+			$stockRows = $this->Database->stock()->where('stock_id', $logRow->stock_id);
+			$stockRows->delete();
+
+			// Update log entry
+			$logRow->update(array(
+				'undone' => 1,
+				'undone_timestamp' => date('Y-m-d H:i:s')
+			));
+		}
+		elseif ($logRow->transaction_type === self::TRANSACTION_TYPE_CONSUME || $logRow->transaction_type === self::TRANSACTION_TYPE_INVENTORY_CORRECTION)
+		{
+			// Add corresponding amount back to stock
+			$stockRow = $this->Database->stock()->createRow(array(
+				'product_id' => $logRow->product_id,
+				'amount' => $logRow->amount * -1,
+				'best_before_date' => $logRow->best_before_date,
+				'purchased_date' => $logRow->purchased_date,
+				'stock_id' => $logRow->stock_id,
+				'price' => $logRow->price
+			));
+			$stockRow->save();
+
+			// Update log entry
+			$logRow->update(array(
+				'undone' => 1,
+				'undone_timestamp' => date('Y-m-d H:i:s')
+			));
+		}
+		else
+		{
+			throw new \Exception('This booking cannot be undone');
+		}
+	}
 }