diff --git a/Dockerfile b/Dockerfile
index ff39f73..3063674 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -56,7 +56,7 @@ RUN cd && wget -q https://gitlab.cern.ch/geant4/geant4/-/archive/v11.1.2/geant4-
     cd /tmp/geant4-v11.1.2-build && \
     cmake -DCMAKE_INSTALL_PREFIX=/opt/geant4-v11.1.2 -DCMAKE_RULE_MESSAGES=OFF -DGEANT4_INSTALL_DATA=ON \
     -DGEANT4_USE_GDML=ON -DGEANT4_USE_OPENGL_X11=ON \
-             -DGEANT4_BUILD_MULTITHREADED=OFF \
+             -DGEANT4_BUILD_MULTITHREADED=ON \
              -DGEANT4_BUILD_TLS_MODEL=global-dynamic \
     -DGEANT4_USE_RAYTRACER_X11=ON /tmp/geant4-v11.1.2 >/dev/null && \
     make -j4 >/dev/null && \