diff --git a/common/waifu2x.h b/common/waifu2x.h
index af6462c..db1b060 100644
--- a/common/waifu2x.h
+++ b/common/waifu2x.h
@@ -9,7 +9,7 @@
 #include <boost/filesystem.hpp>
 #include <opencv2/opencv.hpp>
 
-#define CUDNN_DLL_NAME "cudnn64_70"
+#define CUDNN_DLL_NAME "cudnn64_70.dll"
 
 
 namespace caffe