--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -744,7 +744,7 @@
               POWER_TUNE_VERSION="-mtune=power8"
           ]
         )
-        $1_CFLAGS_CPU="-mcpu=power8 ${POWER_TUNE_VERSION}"
+        $1_CFLAGS_CPU=""
         $1_CFLAGS_CPU_JVM="${$1_CFLAGS_CPU_JVM} -DABI_ELFv2"
       fi
     elif test "x$FLAGS_CPU" = xs390x; then