diff --git a/misc/jenkins/build_working_folder.bat b/misc/jenkins/build_working_folder.bat
index f903377351..74b378c3c8 100644
--- a/misc/jenkins/build_working_folder.bat
+++ b/misc/jenkins/build_working_folder.bat
@@ -59,7 +59,7 @@ cp firmware/deliver/rusefi.bin %folder%
 rem probably not needed cp firmware/build/rusefi.elf %folder%
 cp firmware/deliver/rusefi.dfu %folder%
 
-if %bundle_name%.!=. (
+if [%bundle_name%] != [] (
     cp %folder%/rusefi.dfu %folder%/rusefi_%bundle_name%.dfu
 )