diff --git a/api/models/product.py b/api/models/product.py
index 0f8e08a..bfc9f58 100644
--- a/api/models/product.py
+++ b/api/models/product.py
@@ -38,7 +38,7 @@ class Material(db.Model):
     @property
     def price(self):
         if self.material_price is not None:
-            return self.material_price.price
+            return float(self.material_price.price)
         return None
 
     def to_json(self):