diff --git a/SPECS/ceph.spec b/SPECS/ceph.spec
index 05d1512..9d7f398 100644
--- a/SPECS/ceph.spec
+++ b/SPECS/ceph.spec
@@ -348,6 +348,7 @@ file system.
 #################################################################################
 %prep
 %autosetup -p1 -n %{name}-%{version}
+sed -i 's@ -O3@@g' src/compressor/zstd/CMakeLists.txt src/boost/libs/serialization/CMake/CMakeLists.txt
 
 %build
 %if %{with lowmem_builder}
@@ -787,6 +788,7 @@ fi
 %changelog
 * Wed Dec  6 2023 Arkady L. Shane <tigro@msvsphere-os.ru> - 1:12.2.7-9.inferit
 - Switch macro to python3_sitearch (RHBZ:1784688)
+- Drop -O3 optimization
 
 * Wed Jul 26 2023 MSVSphere Packaging Team <packager@msvsphere.ru> - 1:12.2.7-9
 - Rebuilt for MSVSphere 8.8