diff --git a/externals/zlib-ng/CMakeLists.txt b/externals/zlib-ng/CMakeLists.txt
index 4d3fac33b..d63e3f867 100644
--- a/externals/zlib-ng/CMakeLists.txt
+++ b/externals/zlib-ng/CMakeLists.txt
@@ -1,4 +1,7 @@
 set(ZLIB_ENABLE_TESTS OFF)
+set(ZLIBNG_ENABLE_TESTS OFF)
+set(WITH_GZFILEOP OFF)
+set(WITH_GTEST OFF)
 set(ZLIB_COMPAT ON)
 set(SKIP_INSTALL_ALL ON)