diff --git a/cmake/modules/Distutils.cmake b/cmake/modules/Distutils.cmake
index 5697dff85f..7fdcfe4112 100644
--- a/cmake/modules/Distutils.cmake
+++ b/cmake/modules/Distutils.cmake
@@ -61,7 +61,7 @@ function(distutils_add_cython_module name src)
     CC="${PY_CC}"
     CXX="${PY_CXX}"
     LDSHARED="${PY_LDSHARED}"
-    OPT=\"-DNDEBUG -g -fwrapv -O2 -w\"
+    OPT=\"-DNDEBUG -g -fwrapv -w\"
     LDFLAGS=-L${CMAKE_LIBRARY_OUTPUT_DIRECTORY}
     CYTHON_BUILD_DIR=${CMAKE_CURRENT_BINARY_DIR}
     CEPH_LIBDIR=${CMAKE_LIBRARY_OUTPUT_DIRECTORY}
