diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7739c5b4a..458cdb98d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -77,6 +77,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - \#470 - Small raw files should not be build index
 - \#584 - Intergrate internal FAISS
 - \#611 - Remove MILVUS_CPU_VERSION
+- \#634 - FAISS GPU version is compiled with O0
 
 ## Task
 
diff --git a/core/src/index/thirdparty/faiss/makefile.inc.in b/core/src/index/thirdparty/faiss/makefile.inc.in
index 2aaaf3cd19..744ca6d50e 100644
--- a/core/src/index/thirdparty/faiss/makefile.inc.in
+++ b/core/src/index/thirdparty/faiss/makefile.inc.in
@@ -17,7 +17,7 @@ NVCC         = @NVCC@
 CUDA_ROOT    = @CUDA_PREFIX@
 CUDA_ARCH    = @CUDA_ARCH@
 NVCCFLAGS    = -I $(CUDA_ROOT)/targets/x86_64-linux/include/ \
--O0 -g \
+-O3 \
 -Xcompiler -fPIC \
 -Xcudafe --diag_suppress=unrecognized_attribute \
 $(CUDA_ARCH) \