diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 5dd926e5a9..ab0d9e67d6 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-06-30  Pedro Alves  <palves@redhat.com>
+
+	* lib/mi-support.exp (default_mi_gdb_start): Declare global
+	FORCE_SEPARATE_MI_TTY, not SEPARATE_MI_TTY.
+
 2016-06-29  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.base/return.c: Add copyright header.
diff --git a/gdb/testsuite/lib/mi-support.exp b/gdb/testsuite/lib/mi-support.exp
index 7b5c90b531..28af70a8f4 100644
--- a/gdb/testsuite/lib/mi-support.exp
+++ b/gdb/testsuite/lib/mi-support.exp
@@ -193,7 +193,7 @@ proc default_mi_gdb_start { args } {
     global timeout
     global gdb_spawn_id gdb_main_spawn_id inferior_spawn_id mi_spawn_id
     global MIFLAGS
-    global SEPARATE_MI_TTY
+    global FORCE_SEPARATE_MI_TTY
 
     if {[info exists FORCE_SEPARATE_MI_TTY]} {
 	set separate_mi_pty $FORCE_SEPARATE_MI_TTY