diff --git a/ereuse_devicehub/config.py b/ereuse_devicehub/config.py
index a786ebee..75dfcc8f 100644
--- a/ereuse_devicehub/config.py
+++ b/ereuse_devicehub/config.py
@@ -60,11 +60,11 @@ class DevicehubConfig(Config):
         db=DB_DATABASE,
     )  # type: str
 
-    SQLALCHEMY_POOL_SIZE = config("SQLALCHEMY_POOL_SIZE", 10)
-    SQLALCHEMY_MAX_OVERFLOW = config("SQLALCHEMY_MAX_OVERFLOW", 20)
-    SQLALCHEMY_TRACK_MODIFICATIONS = config("SQLALCHEMY_TRACK_MODIFICATIONS", False)
-    SQLALCHEMY_POOL_TIMEOUT = config("SQLALCHEMY_POOL_TIMEOUT", 0)
-    SQLALCHEMY_POOL_RECYCLE = config("SQLALCHEMY_POOL_RECYCLE", 3600)
+    SQLALCHEMY_POOL_SIZE = int(config("SQLALCHEMY_POOL_SIZE", 10))
+    SQLALCHEMY_MAX_OVERFLOW = int(config("SQLALCHEMY_MAX_OVERFLOW", 20))
+    SQLALCHEMY_TRACK_MODIFICATIONS = bool(config("SQLALCHEMY_TRACK_MODIFICATIONS", False))
+    SQLALCHEMY_POOL_TIMEOUT = int(config("SQLALCHEMY_POOL_TIMEOUT", 0))
+    SQLALCHEMY_POOL_RECYCLE = int(config("SQLALCHEMY_POOL_RECYCLE", 3600))
 
     SCHEMA = config('SCHEMA', 'dbtest')
     HOST = config('HOST', 'localhost')