diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d0092f..d0f45b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,4 +10,3 @@ file(GLOB_RECURSE SOURCES RELATIVE ${CMAKE_SOURCE_DIR} "src/*.c")
 add_library(zstd-jni-${NATIVE_VERSION} SHARED ${SOURCES})
 add_definitions("-DZSTD_MULTITHREAD=1")
 add_definitions("-DZSTD_LEGACY_SUPPORT=4")
-add_definitions("-Oz")