diff --git a/homeassistant/components/knx/schema.py b/homeassistant/components/knx/schema.py
index c17667cbed2..b1d791e3284 100644
--- a/homeassistant/components/knx/schema.py
+++ b/homeassistant/components/knx/schema.py
@@ -112,7 +112,7 @@ class BinarySensorSchema:
                 ),
                 vol.Optional(CONF_DEVICE_CLASS): cv.string,
                 vol.Optional(CONF_INVERT): cv.boolean,
-                vol.Optional(CONF_RESET_AFTER): cv.positive_int,
+                vol.Optional(CONF_RESET_AFTER): cv.positive_float,
             }
         ),
     )