diff --git a/src/power.sh b/src/power.sh
index 0b500fc..68afd8f 100644
--- a/src/power.sh
+++ b/src/power.sh
@@ -28,7 +28,7 @@ boot() {
   [ -f "$QEMU_END" ] && return 0
 
   if [ -s "$QEMU_PTY" ]; then
-    if grep -iq " hard" "$QEMU_PTY"; then
+    if [ "$(stat -c%s "$QEMU_PTY")" -gt 7 ]; then
       info "Windows started succesfully, visit http://localhost:8006/ to view the screen..."
       return 0
     fi