diff --git a/src/pv_controller/config.py b/src/pv_controller/config.py
index 4308a8d..133e964 100644
--- a/src/pv_controller/config.py
+++ b/src/pv_controller/config.py
@@ -51,7 +51,7 @@ class ModbusConfig(BaseModel):
 
 class GlobalConfig(BaseModel):
     """Global settings"""
-    scan_interval: int
+    scan_interval: float
     log_level: str