diff --git a/homeassistant/components/picnic/services.py b/homeassistant/components/picnic/services.py
index b44d4dd5a62..2aafb20abaf 100644
--- a/homeassistant/components/picnic/services.py
+++ b/homeassistant/components/picnic/services.py
@@ -42,9 +42,7 @@ async def async_register_services(hass: HomeAssistant) -> None:
         schema=vol.Schema(
             {
                 vol.Required(ATTR_CONFIG_ENTRY_ID): cv.string,
-                vol.Exclusive(
-                    ATTR_PRODUCT_ID, ATTR_PRODUCT_IDENTIFIERS
-                ): cv.positive_int,
+                vol.Exclusive(ATTR_PRODUCT_ID, ATTR_PRODUCT_IDENTIFIERS): cv.string,
                 vol.Exclusive(ATTR_PRODUCT_NAME, ATTR_PRODUCT_IDENTIFIERS): cv.string,
                 vol.Optional(ATTR_AMOUNT): vol.All(vol.Coerce(int), vol.Range(min=1)),
             }
@@ -73,7 +71,7 @@ async def handle_add_product(
         raise PicnicServiceException("No product found or no product ID given!")
 
     await hass.async_add_executor_job(
-        api_client.add_product, str(product_id), call.data.get("amount", 1)
+        api_client.add_product, product_id, call.data.get("amount", 1)
     )