diff --git a/CMakeLists.txt b/CMakeLists.txt
index 733f9f0806582..df68e39cf14cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,8 +112,8 @@ find_package(Pythia8)
 find_package(Pythia6)
 if(ALICEO2_MODULAR_BUILD)
   # Geant3, Geant4 installed via cmake
-  find_package(Geant3 REQUIRED)
-  find_package(Geant4 REQUIRED)
+  find_package(Geant3)
+  find_package(Geant4)
 else(ALICEO2_MODULAR_BUILD)
   # For old versions of VMC packages (to be removed)
   find_package(GEANT3)