diff --git a/cmake/system.cmake b/cmake/system.cmake
index b3ff3cdb30..720b32eb31 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -147,6 +147,9 @@ if (POWER)
     set(HAVE_GAS 0)
   elseif (CMAKE_ASM_COMPILER_ID STREQUAL "Clang")
     set(CCOMMON_OPT "${CCOMMON_OPT} -fno-integrated-as")
+	if (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+      set(CCOMMON_OPT "${CCOMMON_OPT} -Wa,-mpwr10")
+    endif ()
     set(HAVE_GAS 0)
   endif ()
   set(GETARCH_FLAGS "${GETARCH_FLAGS} -DHAVE_GAS=${HAVE_GAS}")