diff --git a/none/tests/s390x/Makefile.am b/none/tests/s390x/Makefile.am
index a0fb92ef5..ac62506b9 100644
--- a/none/tests/s390x/Makefile.am
+++ b/none/tests/s390x/Makefile.am
@@ -66,7 +67,8 @@ cu14_1_CFLAGS    = $(AM_CFLAGS) -DM3=1
 cu21_1_CFLAGS    = $(AM_CFLAGS) -DM3=1
 cu24_1_CFLAGS    = $(AM_CFLAGS) -DM3=1
 fixbr_CFLAGS     = $(AM_CFLAGS) @FLAG_MLONG_DOUBLE_128@
-fpext_CFLAGS     = $(AM_CFLAGS) @FLAG_MLONG_DOUBLE_128@
+fpext_CFLAGS     = $(AM_CFLAGS) -march=z13 @FLAG_MLONG_DOUBLE_128@
+pfpo_CFLAGS      = $(AM_CFLAGS) -march=z13
 ex_clone_LDADD   = -lpthread
 vector_CFLAGS    = $(AM_CFLAGS) -march=z13
 lsc2_CFLAGS       = -march=z13 -DS390_TESTS_NOCOLOR