diff --git a/install_wolf.sh b/install_wolf.sh
index 8a5079e0210cebcfa4db0983e44caabb68a083ed..3eda7cbce5d9655781eea4c4f637f477bedddbf5 100755
--- a/install_wolf.sh
+++ b/install_wolf.sh
@@ -416,6 +416,7 @@ if [ $INSTALL_VISION == "y" ]; then
    git clone --depth 1 -b 3.3.0 https://github.com/opencv/opencv_contrib.git
    mkdir build
    cd build
+   sed -i 's/char\* str = PyString_AsString(obj)/const char\* str = PyString_AsString(obj)/g' ../modules/python/src2/cv2.cpp
    cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D CMAKE_CXX_FLAGS="-fPIC -std=c++14" -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..
    make -j$CORES
    func_make_install