diff --git a/DDG4/CMakeLists.txt b/DDG4/CMakeLists.txt
index 21b7c45a55f746ac3559149829a0588cc3a4b203..6294baf8b0f082c0e792b50348b8b45a74c47280 100644
--- a/DDG4/CMakeLists.txt
+++ b/DDG4/CMakeLists.txt
@@ -118,7 +118,6 @@ IF(DD4HEP_USE_HEPMC3)
   set(DDG4HepMC3_DEFINITIONS)
 
   IF(ZLIB_FOUND)
-    list(APPEND DDG4HepMC3_INCLUDES ${ZLIB_INCLUDE_DIR})
     list(APPEND DDG4HepMC3_USES ZLIB::ZLIB)
     list(APPEND DDG4HepMC3_DEFINITIONS HEPMC3_USE_COMPRESSION HEPMC3_Z_SUPPORT=1)
   ENDIF()