diff --git a/python/setup.py.app.in b/python/setup.py.app.in
index 9a17f0372fd3f3c626372bf3bdb1cc2f6a922772..6d951f782190f6575f337f6b2ce8fe28a6ccf4b6 100644
--- a/python/setup.py.app.in
+++ b/python/setup.py.app.in
@@ -40,7 +40,7 @@ max_version, mid_version, min_version = python_version()
 if '${PACK}' == 'ON':
     copy_lib()
 
-if os.path.exists(../core/preprocess/hwvideoframe/libgpupreprocess.so):
+if os.path.exists('../core/preprocess/hwvideoframe/libgpupreprocess.so'):
     os.system('mkdir ./paddle_serving_app/reader/lib')
     os.system('cp ../core/preprocess/hwvideoframe/libgpupreprocess.so ./paddle_serving_app/reader')
     os.system('cp ../core/preprocess/nvdec-extractframe/libhwextract.so ./paddle_serving_app/reader')