---
 CMake/unix_config.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMake/unix_config.cmake b/CMake/unix_config.cmake
index 50371cd..554e961 100644
--- a/CMake/unix_config.cmake
+++ b/CMake/unix_config.cmake
@@ -29,8 +29,8 @@ macro(os_set_flags)
         set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -ftree-vectorize")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ftree-vectorize")
     elseif(${MACHINE} MATCHES "riscv64-*")
-        set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -mstrict-align -ftree-vectorize")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mstrict-align -ftree-vectorize")
+        set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -mstrict-align -ftree-vectorize -march=rv64ifd")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mstrict-align -ftree-vectorize -march=rv64ifd")
     else()
         set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -mssse3")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mssse3")
-- 
2.34.1