diff --git a/src/Window.cc b/src/Window.cc
index 13afa610..7ccca604 100644
--- a/src/Window.cc
+++ b/src/Window.cc
@@ -3190,7 +3190,7 @@ void BlackboxWindow::doMove(int x_root, int y_root) {
             snapped = True;
           }
           // snap bottom of other window?
-          else if (dbottom > 0 && dbottom < resistance_size) {
+          else if (dbottom >= 0 && dbottom < resistance_size) {
             dy = winrect.bottom() + 1;
             snapped = True;
           }