diff --git a/src/select.c b/src/select.c
index ce0aa2d..60d5771 100644
--- a/src/select.c
+++ b/src/select.c
@@ -59,6 +59,17 @@ static void update_action(struct dp_selection *selection, struct dp_output *outp
 
 static void do_resize(struct dp_selection *selection, int x, int y) {
 	int ptr_x = x - selection->ptr_off_x, ptr_y = y - selection->ptr_off_y;
+	if (ptr_x < 0) {
+		ptr_x = 0;
+	} else if (ptr_x > selection->output->width) {
+		ptr_x = selection->output->width;
+	}
+	if (ptr_y < 0) {
+		ptr_y = 0;
+	} else if (ptr_y > selection->output->height) {
+		ptr_y = selection->output->height;
+	}
+
 	int width = selection->width, height = selection->height;
 
 retry_horiz: