diff --git a/Makefile.power b/Makefile.power
index 97a466d138..6c5b556de1 100644
--- a/Makefile.power
+++ b/Makefile.power
@@ -111,7 +111,7 @@ endif
 endif
 
 ifeq ($(C_COMPILER), CLANG)
-CCOMMON_OPT += -fno-integrated-as
+CCOMMON_OPT += -fno-integrated-as -Wa,-mpower10
 endif
 # workaround for C->FORTRAN ABI violation in LAPACKE
 ifeq ($(F_COMPILER), GFORTRAN)