diff --git a/Makefile.config b/Makefile.config
index b3b432c21df..4eaaa1f5b2b 100644
--- a/Makefile.config
+++ b/Makefile.config
@@ -18,7 +18,7 @@ USE_CUDNN := 1
 # ALLOW_LMDB_NOLOCK := 1
 
 # Uncomment if you're using OpenCV 3
-# OPENCV_VERSION := 3
+OPENCV_VERSION := 3
 
 # To customize your choice of compiler, uncomment and set the following.
 # N.B. the default for Linux is g++ and the default for OSX is clang++