diff --git a/Geant4/G4config/CMakeLists.txt b/Geant4/G4config/CMakeLists.txt
index 7145788d45bdec7ae8e374b8655fd79c8de2ab17..ac3a9d1bedf896e0c63765117f7f56ac5f08a194 100644
--- a/Geant4/G4config/CMakeLists.txt
+++ b/Geant4/G4config/CMakeLists.txt
@@ -60,6 +60,7 @@ ExternalProject_Add(Geant4
               -DGEANT4_USE_NETWORKDAWN=ON
               -DGEANT4_USE_INVENTOR=OFF
               -DCMAKE_INSTALL_PREFIX=${CMAKE_SOURCE_DIR}/InstallArea/$ENV{CMTCONFIG}
+              -DCMAKE_INSTALL_LIBDIR=lib
               -DGEANT4_INSTALL_DATADIR=${G4DATA}
               -DGEANT4_BUILD_VERBOSE_CODE=${G4VERBOSE}
               -DCMAKE_USE_CCACHE=${CMAKE_USE_CCACHE}