diff --git a/docker_stuff/docker_tourCore2/Dockerfile b/docker_stuff/docker_tourCore2/Dockerfile
index e982b63..69d8fb0 100644
--- a/docker_stuff/docker_tourCore2/Dockerfile
+++ b/docker_stuff/docker_tourCore2/Dockerfile
@@ -128,6 +128,7 @@ ENV icub_firmware_shared_DIR=${robotology_install_folder}/icub-firmware-shared/b
 USER ${robotology_install_user}
 WORKDIR ${robotology_install_folder}
 RUN git clone https://github.com/robotology/icub-main.git -b devel
+RUN cd icub-main && git rev-parse --verify HEAD
 RUN cd icub-main && git pull && mkdir build && cd build && \
     cmake .. \
     -DCMAKE_BUILD_TYPE=Release \