diff --git a/gdb/testsuite/gdb.multi/multi-arch-exec.exp b/gdb/testsuite/gdb.multi/multi-arch-exec.exp
index e9a8abd6748..a5d1ed481a7 100644
--- a/gdb/testsuite/gdb.multi/multi-arch-exec.exp
+++ b/gdb/testsuite/gdb.multi/multi-arch-exec.exp
@@ -71,7 +71,9 @@ proc append_arch2_options {options_var} {
 	}
     }
 
-    if [istarget "s390*-*-*"] {
+    if [istarget "powerpc64*-*-*"] {
+	set march "-m64"
+    } else if [istarget "s390*-*-*"] {
 	set march "-m31"
     } else {
 	set march "-m32"