diff --git a/defaults-o2-epn.sh b/defaults-o2-epn.sh
index ea5912363c..8b73915bb3 100644
--- a/defaults-o2-epn.sh
+++ b/defaults-o2-epn.sh
@@ -10,6 +10,7 @@ env:
   GEANT4_BUILD_MULTITHREADED: 'ON'
 disable:
   - O2Physics
+  - KFParticle
   - OpenSSL
   - curl
   - mesos
diff --git a/o2.sh b/o2.sh
index 4b8aafb1c9..89bb04ed52 100644
--- a/o2.sh
+++ b/o2.sh
@@ -26,6 +26,7 @@ requires:
   - FFTW3
   - ONNXRuntime
   - MLModels
+  - KFParticle
 build_requires:
   - GMP
   - MPFR