diff --git a/tktooltip/tooltip.py b/tktooltip/tooltip.py
index 37c1fad..ab4a183 100644
--- a/tktooltip/tooltip.py
+++ b/tktooltip/tooltip.py
@@ -97,7 +97,7 @@ def __init__(
         self.y_offset = y_offset
         # visibility status of the ToolTip inside|outside|visible
         self.status = ToolTipStatus.OUTSIDE
-        self.last_moved = 0
+        self.last_moved = 0.0
         # use Message widget to host ToolTip
         self.message_kwargs: dict = self.DEFAULT_MESSAGE_KWARGS.copy()
         self.message_kwargs.update(message_kwargs)