diff --git a/gdb/testsuite/gdb.arch/i386-mpx-map.exp b/gdb/testsuite/gdb.arch/i386-mpx-map.exp
index 47efb16ab3..a3488c0d9c 100644
--- a/gdb/testsuite/gdb.arch/i386-mpx-map.exp
+++ b/gdb/testsuite/gdb.arch/i386-mpx-map.exp
@@ -23,7 +23,7 @@ if { ![istarget i?86-*-*] && ![istarget x86_64-*-* ] } {
 
 standard_testfile
 
-set comp_flags "-fmpx -I${srcdir}/../nat/"
+set comp_flags "-mmpx -fcheck-pointer-bounds -I${srcdir}/../nat/"
 
 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
  [list debug nowarnings additional_flags=${comp_flags}]] } {
diff --git a/gdb/testsuite/gdb.arch/i386-mpx.exp b/gdb/testsuite/gdb.arch/i386-mpx.exp
index 2db6401f27..a4166baf57 100644
--- a/gdb/testsuite/gdb.arch/i386-mpx.exp
+++ b/gdb/testsuite/gdb.arch/i386-mpx.exp
@@ -27,7 +27,7 @@ if { ![istarget i?86-*-*] && ![istarget x86_64-*-* ] } {
     return
 }
 
-set comp_flags "-fmpx -I${srcdir}/../nat/"
+set comp_flags "-mmpx -fcheck-pointer-bounds -I${srcdir}/../nat/"
 
 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
      [list debug nowarnings additional_flags=${comp_flags}]] } {